Forum issue with emojis

I often find if I try type an emoji for a post, the emoji will be inserted, but the same emoji will be inserted at earlier parts of the text too. I then have to go back and remove them. I don't know what causes it but best guess it is some replacing some combination of letters. It always seems to be at least a space which is replaced.

For reference:

  • Android 16
  • Firefox 150
  • Keyboard GBoard 17.2.8

It most recently happened in this post:  RE: BBC Article: ADHD has rewired the workplace. This is what it means for bosses and workers 

I know not many use firefox mobile so don't know if that's the cause, or maybe this just isn't often encountered/reported. This is the only site I've seen it on.