Not sure about the down arrow in particular but I have seen objects (e.g. a corner of a book) accidentally lie on a key at the edge of a keyboard before.
Can you replicate it?
If you can, you can create a bug report. If not, it's probably a one-time thing where the stars alligned and the conditions where just right for it to happen.
This is GRUB’s final warning before you dig too deep in the OS list. Never hold ⬇️ for more than 45 minutes. If you do, make sure you have punch tape with a bootloader available or you'll have to manually enter machine code instructions to get your computer back up.
As in you are seeing multiple boot entries? It's likely one entry per kernel version that you have installed. It doesn't happen often these days any more, but in some situations it's handy to be able to revert to a previous kernel if for example third party modules break.
its per fedora version for some reason, and i dont think that such a fallback would even work since fedora removes the previous kernel core and most other garbadge from what ive seen
I don't know about Fedora, but Debian keeps at least the previous version. However, that's about it. There remain only 4 (2 normal + 2 recovery) GRUB entries and the additional ones vanish automatically during the uninstallation procedure.
I had an old laptop do this some years ago and it was because the graphics card was broken. I had dual graphic card and found a way to disable the broken one in bios (dedicated one, could continue on intel graphics) but the computer was too old to reliably use much longer and it died even more a few months later.