Ovulation twice in a month?

Amber • 30 years old. We have one daughter, born on 2/10/14. TTC #2 since December 2014. Finally pregnant with #2 due 12/4/17!
I got my high fertility days (flashing smiley) Thursday and Friday last week. Saturday I got my peak smiley OPK result. Yesterday I took a different OPK and it was back to low, or no smiley face. Today I had another dip in my temp so I took another ovulation test and it said I was peak! Has this happened to anyone? And what does it mean??? Here's my chart: