fertile days appear late in the app calendar

Lately I notice that I've been looking for mine fertile days changing a lot and I missed a couple of them, I started worrying because it's the app fault, like I complete my log in daily, and let's say at night shows that I would start my fertile days in 4 days, I keep logging daily and in the supposed 4 fertile day I enter and it showed me that it's my last fertile 7,2% day... I meant, all the jo fertile days turn green when they were purple before, And also says ("have sex every other day to get good sperms" ) so it's driving me a little bit crazy lately because the fertile days calendar changes daily and I missed for 3 months my most fertile days that weren't fertiles in the beginning but turn into fertiles, do I explain myself? Anybody having the same issue?😩