I would have serious doubts about these OPK's. In fact I would disregard them altogether. Do you have PCOS? It can make you have the hormone surge and many pos tests even when you are not ovulating. Do you chart your temp at all? This is a much more accurate way of working out your cycles and discovering when you are ovulating and even IF you are ovulating.

In a normal cycle, OPK's would show a pos for 2-3 days as the surge only happens around 48 hours prior to ovulation. After you've ovulated it should go back to being neg.

Another thought- have you done a preg test? Sometimes a pregnancy can make OPK's show pos results.

Good luck honey