Nokia N97 :: Maps 3.01 Error After Recalculating Of A Route

Yesterday I had some curious experiences with my n97 and nokia maps 3.01.After I heard on the radio station, that on my route is high traffic i decided myself to choose an other driving route. Short time after I passed the exit i had orgrinally to enter, nokia maps recalculated a new route for me. So far everything works fine. Nokia maps send me now to the next exit of the highway. Here I should have done a u-turn. In my oppinion it made no sense to drive the way back to the originally exit, because the driving distance was twice as much as from the point of the u-turn? I think there is a buck in nokia maps regarding that point.Another thing which made my curious was, that after the recalculation, nokia maps tried to send me all the time on opposite site the highway enter.If anyone knows something about this points let me know.