It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

As stated in the title, my Geralt has problems with descending stairs. Like once every three times he will tumble down, regardless of the walking speed. Not a serious problem, but it does ruin the atmosphere here and there. Is it a bug and is there anything I can do?
This question / problem has been solved by DarklordGriffenimage
Yes it's a bug, unless a mod out there fixes it, can't really do anything.
You can try the No More Rolling Down Stairs mod on the Witcher 3 Nexus mods site
Instead of doing a combat roll, Geralt will do a little stumble forward.
It's not perfect but it's a lot better than rolling around and i didn't encounter any issues personally using the mod