FR24 CVT diverts.
It is indeed a common problem on FR24 to show flights diverting to CVT from BHX.
Flybe flights especially get this treatment on a regular basis. I guess it is due to the ADS-B feed is lost on certain aircraft once they get below a certain height,or,before they get to a certain height in the climb.Flybe Dash8Qs and ERJs regularly show up as diverting to CVT.Possibly because CVT is relatively close to the final approach to BHX on rwy33,the FR24 computer or whatever it is guesses that because the feed is lost at this point it assumes the flight has landed at the nearest airfield which is CVT.