Cursor Moving independent of Text in code window

I started using codingame at home a little while ago, tried it on a few different computers today, and found that the cursor seems to move to the right far ahead of the actual point of editing in the code, the gap between the two is 0 on the far left and gets larger and larger the further you go across, until the cursor is very far divorced from the actual point a character will appear if you type.

This makes editing next to impossible. Please let me know how I can resolve this.


This bug is still present, and has clearly been there for a long time! Can anyone fix it please? I am using Firefox, by the way. This bug makes using the editor almost impossible and is a huge discouragement to writing tidy code.