CLEARBLUE digital OPK confusion...

It has been a year of TTC with no BFP, so I decided to try a different opk. AF arrived on Nov.10th- 14th. I began testing on CD8 and got a negative. CD9 I got a positive (flashing- high but not peak). So on CD10, I got my first official positive opk. (picture 1) I stopped testing for a couple days. It is now CD13, so out of curiosity, I tested again and got another positive (picture 2).

Will the tests stay positive until the next cycle? Has anyone else had this happen? Any advice?