Why did my cover line change?

Vickie

After ovulating my coverline was quite high and I was worried as my temps were below the line.

See chart below:

Then when I entered todays temperature my coverline completely changed.

I just want to know is this ok?

My coverline never changed with glow, still high with temps below the line.

I was wondering if this could be a sign of low progesterone?

Any advice would be greatly appreciated 😊