Need help with Graph

Okay so last my cycles are irregular (32-44) days long at least. Last month it looks like I ovulated near the end of my cycle (around day 40)

(Chart below) I also just started tracking my bbt last month so I don’t have anything else to go off of and have been doing it each morning.

But then this cycle….it looks like I kind of ovulated around cycle day 13???? Idk if that is right. Again this is my first time tracking my bbt

See below. Is that just a coincidence?

Any help or insight would be soooo appreciated!