Hi Shira. There's a difference between these two verbs: פ.ת.ה which means "to tempt" & פ.ת.ל which is indeed, to curve/twist etc... In this context though, the only possible meaning is not to be tempted (stray from a moral road) or "not to twist/curve a straight moral road", hence your confusion. Since the Torah speaks about morality standards, this is probably the case