Modified clients will modify internal map info in ways that can easily confuse WRobot but not the user itself because everything is visually adjusted.
Also, I highly recommend you use Quester, not Grinder profiles. Some grinders just make you walk a pre-determined path and to get there in the first place, it'll try a straight line.
Also, you don't own a WRobot license, I doubt you'll be getting much more support.