After inputting a character, position is reset to the right

[nbraud]

This makes it impossible to edit a mistake in the middle of a line

[smotchkkiss]

… or to add a word at the beginning of the line before hitting enter when you realise the subtitler you are following up to left out the last word you were expecting.

[nbraud]

This seems to be fixed for me (Firefox Nightly, 52.0a2), but another angel still has the issue on Chromium v55

[zestyping]

I am experiencing this problem too. I'm using Chrome 55.

[zestyping]

I confirmed that I experience this problem in Chrome but not in Firefox.