my calendar used to remember previous information but doesn't now, whats happened

[Windows Central Question]

I used to be able input birthday, visit to doctors ect and I could go back to previous months in calendar and they would be there. Now suddenly they aren't all information when I get to end of the month disappears. Can I fix this

 

[Laura Knotek]

Hi and welcome to Windows Central.

What device are you using? What version of Windows is it running? What calendar app are you using?