Here I have two words:
verto, vertere, verti, versum (versus)
vertor, verti, versus sum, — (I assume it's deponent)
They both mean "turn" according to the Cambridge Latin Course Book V, but a quick search on wikitionary of vertor says:
first-person singular present passive indicative of vertō
Does anyone know whether vertor actually exists, and if so, why it does and it's difference to verto?