Problems with ILS capture

I did a test flight yesterday (Yes, still testing the PMDG as I have not been able to do many successful flights yet) with a simple situation. KBOS - Active RWYs 22s Start the plane from Cold & Dark, set everything in FMC properly for a KBOS DEP and KBOS ARR Set radios to ILS on both NAV1 and NAV2, set cursor to correct RWY22L Take off normally 22R (Albeit the horn sound which I still cannot figure out why, everything should be set correct, flaps and trim) Engage Autopilot at around 2000 feet with RWY HDG, reaching 5000' turn around for 22L Base Airplane now is set for arrival, AutoBrakes set at 2, flaps 15, Spoilers Armed, ALT at 4000 and now with a HDG to intercept the RWY22L ILS Everything is fine until the plane captured the ILS and started a turn toward it, nice, seem everything is going to be ok, BUT it kept turning LEFT, I have no idea where was this plane going to, so I disengage the AP and AT and hand flied the beast down to the numbers with no problems.... FlyTampa KBOS scenery and FSrecorder active recording the land for test...