Portal Customisation seems to be broken on Firefox

[Seriel]

Was tweaking the customisation of my portal/homepage of GBAtemp today, but I noticed that the blocks I was putting in places weren't staying in the correct location, and instead moving about seemingly randomly whenever I saved.

I use Firefox as my main browser, and I tested it in Chrome and can't seem to reproduce it so I assume it's either a Firefox thing or something unique to my browser setup. Would appreciate if fellow Firefox users can verify this so I know whether I'm going crazy or not.

Here it is in action, I moved some blocks around and upon refresh they move of their own accord:

Spoiler: Large gif, geez I move my mouse so fast

Since recording that gif I decided to try just pressing Save without any changes and sure enough they all jumbled up into the wrong places again. Quite strange.

 

[The Real Jdbye]

Was tweaking the customisation of my portal/homepage of GBAtemp today, but I noticed that the blocks I was putting in places weren't staying in the correct location, and instead moving about seemingly randomly whenever I saved.

I use Firefox as my main browser, and I tested it in Chrome and can't seem to reproduce it so I assume it's either a Firefox thing or something unique to my browser setup. Would appreciate if fellow Firefox users can verify this so I know whether I'm going crazy or not.

Here it is in action, I moved some blocks around and upon refresh they move of their own accord:

Spoiler: Large gif, geez I move my mouse so fast

View attachment 187791

Since recording that gif I decided to try just pressing Save without any changes and sure enough they all jumbled up into the wrong places again. Quite strange.

I've been using Firefox for a long time and I haven't had any issues like that.
It's hard to tell where the gif starts and ends so I don't really get much useful out of it. Otherwise I'd try to reprodue the issue for you. If you tell me the exact steps to reproduce the issue, I can try to reproduce it for you, and it will be easier for staff to fix.
Just making sure, you did save changes right?