Cases get transferred all the time, usually because they want to check something a bit more carefully, e.g. employment situation, AC-21 etc. Lately the VSC has been transferring lots of cases, up to 50% for some months.
Unfortunately, once a case is transferred, it's "off the books" as far as the regional service center is concerned and depending on where the local center is located, you could be in for a long wait (6-12 months). It's also hard to get information on processing times for many (most) of the local centers...
ETA