I had this same issue with the site displaying the same avatar for multiple saved avatars. This is how I handled it so that it'd update for me & display the correct image. If you don't want to wait? This may still work; it did a month ago.
For anyone who has an issue with their Saved Outfits in the Wardrobe displaying the same saved avatar image over & over again / it displays the wrong outfit? Don't delete them! Don't bother remaking them! Try this:
Click the outfit.
Click the green pen icon underneath the word Outfit. (You may not even need to rename it.)

Click the green checkmark.

Click Back to Outfits.

It may instantly reload the Saved Outfit image properly, when you go back to the previous page.
A majority of mine instantly refreshed to the proper saved image, but a couple outfits needed to be renamed before they updated properly.
If it doesn't work for you?
Sure, it'll take a little bit of time to click a couple buttons, but it's better than remaking everything & your previews will be correct again. Hope that helps, if it does~ ❤️
YOU are a lifesaver! 😭 Tysm! I just fixed over 10 pages worth of HAs affected by this glitch! Thanks to you, my HAs are back! <3
This is so funny, it starts on page two, for me, and i have 9 pages of saved. xD
((the middle right one, 'rainbowsplooge' is the copied picture xD))

This is still an issue--how is a fix coming along?
Not only are the previous duplications still there, but today, my outfit called Garden Tea took over the thumbnail of 7 other outfits. And the one called Captain invaded its neighbor's thumbnail.
This is getting really bad now. Every day I try to fix the cloned but literally they are cloning faster than I can even fix them at this point
This is happening to me too!
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Oh, lord, I just looked and it's so bad.
Previously, I had about 20-30 pages at the end all duped. I spent a few hours and managed to rename most. They came back visually in the wardrobe, but most didn't show correctly on the shared page. But I figured I would revisit later.
I just looked and I have newer outfits, that were previously working just fine, that were swallowed by neighbors. I haven't even been in the wardrobe in days!
In my wardrobe when I try to make a HA everytime I add an object it highlights a bunch already there and I can't move it without clicking the highlighted ones to remove it. Is anyone having this problem too? I'm so frustrated. I love making HAs but its getting to be such a hassle I don't want to nearly as often.
I wonder if it's also impacting other parts of the wardrobe. I change my avatar every day for Masquerade. But depending on what page I visit, sometimes it shows the avatar I wore 3-4 days ago---just that one.
EDIT: I tried renaming my outfits to correct the thumbnails, and it didn't work on my version of Chrome.
EDIT: Made two new outfits, and the issue gets worse. At least 3-4 more thumbnails have invaded their neighbors. And the renaming thing still doesn't work for me. Can we please get a fix/update?
Yes, an update fix for this would be amazing!
I've lost outfits from my wardrobe that I didn't delete and I have cloned outfits as well.
Ugh... I started deleting some of those clones before realizing my other saved outfits were hiding in there. Think there was only 1 I'm interested in redoing, lol.
Annoying.

Thanks to Ryuu's invaluable info I made some old avatar thumbnails show up. But also have a mixture of wrong thumbnails on the avatars now. Also when I put them on, I'm bald often :-(
I made the mistake of deleting a bunch of the clones before I saw this thread, so that's a huge bummer for me, considering the outfit that was cloned is no longer saved anywhere for me now loll.
But the renaming the outfits fix worked for me so there's that.
Even without saving any outfits, I had half a dozen duplicate themselves yesterday. I just enjoy looking at the outfits like a museum, but it's annoying when I have (at its worst) 3 pages of the same image.
Still having this bug months later. Will this ever be fixed of should I start renaming outfits so I can see them and use them again? I regularly go and use old outfits as bases for new HA.
I has been so long now, any updates would be appreciated at this point.
Mine started as a few outfits cloning each other. But when I click on the outfit it's the cloned outfit, not the outfit it's meant to be. In other words, I'm missing at least 2 outfits. It's frustrating, i'm worried i'm going to lose more.
edit: I've had to remake and save 3 outfits.
[flower=shylock]
[tot=shylock]
I agree - I keep seeing new clones now and its just awful.
Any hope of this being fixed any time soon? I know you have a lot going on, and I appreciate all you do, but this is really getting to me and others. Thanks.