Why the difference?

Er

Glow gave me a coverline after I put in my temp this morning but Fertility Friend hasn’t given me crosshairs:

I hear all the time about how FF is more accurate... I don’t know what to think. Could I not have ovulated? I still have some ewcm this morning but had an negative opk. Has anyone else had a difference in their charts on Glow vs FF? Thanks in advance!