Is the app glitching with anyone?

I’ve been using this app since it was called flow and i’ve loved it ever since (still do), but the app just pushed my dates and mixed it up. I’ve been stressed that my period was late for 9 days, but when i finally got it (today), i opened eve to log in my cycle as usual, and i realized that the calculation was all wrong. It set to start 7 days before my actual period day (my cycle is usually 28-30 days). So it scared me and stressed me out glitching with the dates. And i checked future cycles, they have the same problem too, the dates are all behind schedule and i was wondering if anyone else has this problem?