I reproduced the issue of @abowsher, didn’t be allowed to reply to the same thread.
I set 3 fixed columns and the alignment issue is triggered by width changes in the other columns (https://jsfiddle.net/oskrd/w9bdtuog/7/)
Also if you scroll all the way down, you will see as if the fixed columns were part of a different table and they’re over the other columns, I can see an overlap there.
Any help to find a workaround will be appreciated.