Glows calculated period and ovulation day are wrong

:(

So my chart shows my period day ending the 9/24 and ovulation date was the 4th but It also says my next period is the 18th which I know it won't be , it will be the 23rd which means my fertility and ovulation dates are wrong , that makes it really hard to decide when to have sex for TTC. I tried to change it but it says you cant add future periods . Help I'm pretty frustrated, I'm newly TTC and I'm relying on this apps calender to help our chances