Willy, this is almost unbelievable!
No idea, sorry. Mainly because track recording system is only a "consumer" of received locations. It do not promote any changes back to system, so I have absolutely no idea, how may track recording affect coordinates ... technically it is not possible.
I just published new Beta version so try it please if possible. I won't do any bigger changes, so this version is candidate for release to Monday when I plan publishing. I'll do also some more testing. Few hours ago I was just training (running), so only track recording was running and only small problem at start, but simultaneously running different recording application, recorded exactly same track. Weird...