All three look positive to me, but I would doubt you ovulated over a few days. Are you on fertility meds? When I had a few days of positive opk's when I was on clomid, I did a little 'net research and was told that it is possible to get a few days of positives. This is because LH peaks (surges) about 12-36 hours before ovulation occurs, and then dissipates. So, you could theoretically detect this high level of LH with positive OPK's from the time it begins to the time it dissipates-- over 36 hours.
It is also possible that your body is "gearing up" to ovulate, and you have an LH surge-- and then, for some reason (such as stress, illness, travel, or random fluke), your body fails to release an egg . . . then tries, tries again ASAP with another, or overlapping, surge. If this happens to you occasionally, it's no big deal. If it happens a lot, talk to your doctor. This is from the good folks at poas.com.
Are you taking the test at the same time every day? I know the levels of LH are higher in the am, so you're not supposed to test with the pee stick kind until around noon - 8pm. That could also be affecting the results.
One final question. Do you think you may be pregnant? The reason I ask is because opk's can be used as hpt's. LH and HCG (the pregnancy hormone) are nearly identical at a molecular level, so an LH kit can turn positive if it reads the HCG (although that can't be used in reverse- a hpt cannot be used as an opk). While I personally wouldn't use an opk as a pg test (because there could be lots of reasons why the opk is turning positive, only one reason meaning pg), and I don't want to wonder.
You may want to go to
www.peeonastick.com and do some research. It's quite an interesting site! You also should talk w/ your dr and get your hormones tested if you continue to get a + result.
Good luck!