Collision isssues...everywhere

Having purchased BL 1,2 and TPS for PC recently, and being a vetran of the series on the 360, I have noticed the PC versions to have a hell of a lot of collision issues, which were not as prevalent, as on the 360.
I am currently solo playing TPS and I find them virtually everywhere, even to the extent as on flat ground.
It’s annoying as hell, especially considering, while there are many places that have invisible ledges, there are just as many places where there SHOULD be a hard surface, but there is none.
In addition Gearbox, if you build a game that is intended to be played vertically, don’t put invisible walls in the middle of the map.