Looking at the source code, this appears to be caused by a feature where a pushable's `target` is set to the object that's pushing it, limited to either a player or another pushable. Since Brak's electric barrier has the `MF_PUSHABLE` flag, it sets its `target` to any pushable that collides with it. The electric barrier uses `A_CapeChase` which automatically snaps the barrier's position to its `target`. A possible solution would be to use the `tracer` variable instead, since `A_CapeChase` does have support for it. However, this could break compatibility with some addons.