It depends if your run is on the current patch (2.0) or Pre 2.0. You should upload the run to category with the same patch as you've played the game.

I don't think it's possible to tip over the chair in 2.0, it only seems to work on Pre 2.0.

Okay, thank you so much :)

I'm very new to speedrunning, and I couldn't find where this information should be.

If I already have submitted a run, but i beat my time and want to replace my old record, do I have to go to my current record and edit it, or do I need to submit it as a new run? :)