I've heard of this bug but have been having difficulty replicating it reliably. If you know either what's causing it specifically or what you can do to replicate the problem every time, let me know. Hard to troubleshoot this when it seems to fix itself after a couple tries. :/
Fatelblade also reported this happening when Previewing forum posts so it doesn't seem limited to the profile editor.
Fatelblade also reported this happening when Previewing forum posts so it doesn't seem limited to the profile editor.

Thanks to Minho for the sig!
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So I tried re-adding the other gif like so:
Updated and it refreshed again and we are back at square 1:
This has happened every time I've tried adding an image to my signature box for the past few tries, over the past couple weeks or something I'd guess? It'll just pretend like I never added that extra image in after I click update.
Edit Well it's sort of resolved. My friend told me you don't need https:// with imgur links, when I removed it from both gifs and updated the bio, the second gif didn't get deleted. However, the images were invisible. HOWEVER when I then edited the bio to reinclude https://, it worked. So it uh, it's fixed I guess.