(Perhaps nothing...)Bear Hunter trap stack bug

So, I got a bunch of towers that have the withered time warp effect. It seems that having that time warp effect trigger just before walking over my Bear Hunter carry traps causes them to just ignore them. On further waves, it appears to be only two tiles that are barely touched. Noted with challenge wave. Perhaps there is an issue if the number of traps goes beyond a certain point? Just got a challenge wave stunned on those points, and it's health was slowly drained. Might just be an exceptionally high health wave walking over it really slowly...