Shortcut is not working...

For some reason the shortcut "F" for favorite is not working for me, while others are still working fine. Does anyone else have the same problem or is it just me?

Edit: So, I pressed the "F" after favoriting a post by mouse. It did appear "You have already favorited this post". Interesting...

bumping to get this out of the spam posts.

@Abbentt you might want to post in forum #9127 too, though I see a github ticket has been made for it, so maybe not. https://github.com/r888888888/danbooru/issues/3674

Also having the same issue here. All the other shortcuts are working perfectly.