As you (probably) already know, many users use support stamps, where they create images saying "I Support (their username)" and other users will place it on their profile to show their support.
I was recently reorganizing the support stamps on my profile, by putting them into a spoiler (since I have placed a lot of them on my profile). I've also updated them with the newer versions, for people who have changed username or just don't like their old stamp very much.
But at some point, the old support stamps (which I was still moving, I was making sure that I had everyone, and for certain members, my profile was the only place I could find their stamps) stopped showing up, and once I moved them in and removed the older versions, those new ones were invisible, yet still there; I know they were because right-click and "Open image in new tab" still worked to see them, and the gaps for them were visible, just not the image itself.
Reloading seems to cause them to appear again, and when I edit they are visible, but after editing, they are gone again.

Browser: Google Chrome version 91 (on PC, if this version is also available for mobile)
OS: Windows 10

Link to the post, if needed
Let me know if you need more information.