I just rolled out of bed and did my first quest of the day, only to notice that the very first main shop purchase already had a discount. I clicked on the little coupon and found that I have a whopping 1 day 19 hours+ on the buff. I think it's been adding time instead of counting down.
Edit: I didn't want to make yet another bug thread in the same week so I'll just stick it here. I thought I was going nuts, but for some reason, the 'your shops' page isn't reflecting exactly how many items I've quickstocked into it. Nobody's purchased that many items from my shop in ten second span to warrant such a huge gap. I can't tell whether it's the number reflecting poorly, or if my items are getting gobbled by more site errors. Normally, I wouldn't even bother bringing stuff like this up, but I'm wasting my GA if it's the latter.
Mine is also doing this, and I think I saw a thread within the last day or two about the extra wizard quest buff doing a similar thing. Don't have any advice, just figured I'd post to confirm it's happening to more than one person!
Mine's at: Main Shop Discount Expires in 1 day 13 hours 11 minutes 52 seconds.
I'm going ahead and questing anyway :(. I don't think its abusing a site glitch because we aren't going out of our way, just playing the site as usual. Not questing would give me a lot of more of penalty than the benefit I get from the bonus.
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Ok, so glad it's not just me going crazy but...
Main Shop Discount 15% off items in the NPC Shops! Expires in 1 day 10 hours 7 minutes 33 seconds.
I thought the extra extra time for the shop buff was another gift from the Subeta staff(seriously).
Expires in 1 day 21 hours 16 minutes 9 seconds.
Yep, mine is doing the same.

Mine as well- though I didn't even notice until I saw this thread. I RS a LOT so I have a Main Shop Discount Buff quite often. Didn't even realize you could click on it to see how much time's on it! O_o
Main Shop Discount 15% off items in the NPC Shops! Expires in 1 day 7 hours 43 minutes 10 seconds.
Name tag by Cyroris
Not all those who wander are lost ~ JRR Tolkien
[flower=Bren]I'm having the same problem.
[font=georgia]Or perhaps in Slytherin
You'll make your real friends,
Those cunning folks use any means
To achieve their ends.[/font]
I didn't even notice at first because sometimes I quest so fast I don't realize when I get the buff but then I saw I got the buff on FRIDAY and now it is Sunday. I don't want to take advantage of a glitch, that seems like stealing but I need to quest coz that is how I make my dime and it's Luminaire and I want to buy nice things for my friends.
Yes, I happen to have both the extra wizard quest and the main shop discount buff and both seem to be behaving the same way, so looks like it's some sort of buff timing issue - don't know about the main shop discount because I didn't think to check, but the wizard quest buff was counting down correctly until it should have expired - then started counting up. Hope this is helpful to find/fix the problem.
I was assuming that it was my discount card acting in shops not the buff but just realised I'm having this issue too:
Main Shop Discount 15% off items in the NPC Shops! Expires in 2 days 4 hours 53 minutes 18 seconds.
I'm just carrying on questing as usual because it doesn't seem fair to miss out on quests, but I shouldn't have this buff any more!
I've got a Main Shop Discount buff due to expire in 2 days 16 hours.
Mine is doing to same thing. I looked at it on Friday, and it said it expired in a day, so I was like..whatever, it'll be gone soon and I didn't quest on the weekend. I went to look at it this morning, and now it's at 2 days 17+ hours.
So confused.
Oh shit i didn't even notice i thought i was just getting it again without realizing it. >_<
But nope.
Expires in 2 days 15 hours 39 minutes 53 seconds.
_<
[IMG]http://i68.tinypic.com/2ugp3i8.png[/IMG]
Both buffs are glitched. I didn't get my bonus Wizard quest when I got that buff today either.
Edit: The wizard quest buff is not expiring either. Time keeps getting added to it.
I just checked my wizard quests and the extra one was available for me to do, but the buff is still adding time. It's currently up to Expires in 3 hours 23 minutes 51 seconds.
I have my shopping buff since nearly 48h now. Already posted about it yesterday, but since nobody seems to care, I don't care about it either.