My Garmin gps does crap like that too. It'll tell me to take an exit ramp and then back on the onramp in a few places. If I'm in the middle of NY it'll want me to drive 60 miles the wrong way to I81 instead of just taking 14 and get on US15 in PA. It usually wants me to drive through the Dallas cluater#### when I already know better to take 287 to I20
Gps is pretty much useless after driving everywhere for years but it's good to use it to remind you where to turn sometimes.