There are a couple items that are not showing in my avatar, in the face and head layers. I tried to remove and then add them a second time but the problem is still...

Do you have enough layer slots? You can only wear 2 items per layer for free.

I have. This customisation was made yesterday and worked perfectly.

Yesterday, everyone was given a free gold account for the day for the downtime. That meant that if you had three items on your face, you would have been able to save with three items.

Since it was a day long and has since expired (you're back to the blue icon), I would say that's what happened.

Thank you. I did not knew it.

All solved here :)