Atc And Taxiing

Hi all,I was wondering if I could solve this problem. I have installed many new sceneries from Aerosoft and FLYTAMPA, and the problem is following the ATC directions when taxiing.When I taxi sometimes with any aircraft, I will obtain incorrect instructions for taxiing, especially with the new products and I don't know why. I understand how to taxi well using the Alpha Beta Cuba language and how to interpret the taxiways, however it seems that this is wrong in FS.There are times when I taxi, and after writing down the taxii instructions, I try following them, but they take me to wrong taxiways but to the right runways. At the end I get there because I decide to take any taxiway, but I don't like doing this since it's not REAL.Can anybody help me with this? :( Kind Regards,James