I read something in the update about the mine being changed so it fit better into the environment or something?
I played 2 games as Proxy last night, I was still able to put mines in strange places that sat in funny angles. I even had one floating about a metre in the air on Trainyard on the fence, where you come up the stairs (from the attacking side if you go left) that enters the actual train tracks.
Maybe you should add a screenshot of the spot you mean! Helps them understand quicker what you mean. 
I’m getting this bug a lot. I was just using that one spot as an example. For instance, in the second part of Trainyard where you have to plant C4 inside the train, you can plant Proxy mines nearly on the ceiling. If you jump and throw them or just stand really close to a wall and throw one it seems to just stick to the wall at a random spot.
All of the above are collision bugs… You should report every spot you know! 
They’re literally everywhere though on every map. I don’t have time to post that many screenshots up. Find a wall that isn’t straight up and down and throw a mine at it, it’s going to sit in mid-air. Almost every set of stairs I can find aswell makes the mine sit on a funny angle and sometimes floating in the air a little bit.