I am using QGIS 2.14.0 and I need to fix some topology errors. Problem is that when I move polygon node to the another node they seem to snap correctly. However, when I move that node again, in too many cases snapped nodes don't move together, and of course topology testing will fail. Is there any way around this problem?
I attached few images below. I've tried to turn off and on "Enable snapping on intersection" and "Avoid intersections". I've also experimented with different snapping tolerances with no success.