Question: Expert Chart Help Needed!!

Hi ladies, I am new on this site and didn't know where to post this so I am posting it in a few different categories.
I am in need of some help with my BBT chart. My cover line is always around 97.7 and FF has it set at 98.25 this month...some months that is my high after O temp!
FF changed my O date from cd 9 to cd 11 and now to cd 13 making CL 98.25. It just can't be, other months I was even on progesterone after O and the past 2 months I haven't taken it.
Hope I can add my FF chart for you to see..this is so bizarre!