Ovulation twice in a month?

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: