Eve calling it wrong?

Hi, since I input my data into <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> the first time. I either get my period late consistently or something's wrong... does <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> not take into account new cycles that you input to all your next period's start date?