When rowing, using the rowing app on my Venu2S, it registers my tempo. my average tempo is reasonably correct (3:30/500m), but the fastest tempo / best pace given is then 3:58/500m, which is about double from what I did. also, the distance per stroke is 1/100 of what is the real distance. Something is wrong. It has been like this for a few weeks now. I have changed nothing. Please help. thanks a lot.