fertility window moves all the time? wtf am I missing my window?

Mandi β€’ πŸ’•πŸ‘ΌπŸΌπŸŒˆπŸ‘ΆπŸ» πŸ‘ΆπŸΌ ttc 🀰🏼
I feel like this happens every month when it comes time for af and she doesn't show up and the app adjusts the fertile window. Does any one else have this problem? I'm getting really frustrated BBC my charts I don't think show an obvious ovulation spike. Should I be worried that I'm not ovulating at all? Af due today & neg hpk wouldn't I have a positive by now? The first 2 pics are what I started the month with and next 2 are what my chart changed to. Any advice/observations?