Hm. so, here is how temps worked for me. I would start cycle day one and take temp each morning first thing, even before getting out of bed. When I ovulated, my temp actually went up about a degree. And it stayed up until right before I got my period (like would dip a couple of days before and be totally down to the starting point by time period was in full swing). The only two times it did not dip back down was when I was pregnant with my two sons.
So, if you could explain what is happening again, I'll try to comment. You started taking temp and it dipped BEFORE you ovulated or early in your cycle?