Period prediction

Estefany

I have a question . Well since i had my last kid 12 years ago my period. Been slight irregular I use other <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> app and the periods on those apps are almost precise . But , not

On this app this one always have it about 5 days out . Does anyone else have this issues ?and, if there’s a way to correct it