Why do I have different covelines?

K

FF & Premom are giving me two different coverlines.

I have been iffy about my temps all week because I pay attention to ff more, so my temps are just riding the cover line, making me concerned. But I noticed on premom it has my cover line much lower making my temps seem more “healthy” on the chart.

Why would that happen? I haven’t discarded any temps.

Also should I worry about the temps being on the cover line like that?