It depends on the tank it's "colliding" with. Some tanks have a huge bounding box, Churchills and Black Prince are a prime example of those, as is the tiger. Their bounding box we get from the game is problematic with them because we draw a circle around the tank to determine collision, and with huge square tanks, the circle is actually being drawn like this:
And anywhere within that circle TL will think it has hit the other tank, while it really hasn't. We can compensate for this by making the circle smaller or increase the tolerance, but you'd run into the issue where it wouldn't consider itself stuck if it hit a corner of those tanks, which isn't really ideal either.
We're back to the drawing boards for now to see how we can make this actually work and we'll rework the collision system if we have to. For now, you can disable collision detection in the configuration file (GlobalSettings.xml) if it's too problematic, but expect quite a few updates which should address this issue the coming few days.