Last login command in Terminal is not listing recent logins

Hi, just about a week ago I noticed that the Terminal command "last login <username>" is not listing all logins. The list's latest entry is 28th of February. This is incorrect, as every single day since then I have logged out and in. I also shut down my computer each night, but the command "reboot" lists 28th Feb as the last entry. This involves other user accounts too and not just one. I haven't updated macOS in February, and I can't think of anything I've done that could have caused this.

Can anyone tell what could be going on and how can I fix the log?