Why are my emails being marked as unread after opening them?

1. Check the settings of your email application:
   Many email applications have an option that lets you mark emails as read or unread. Look in the Options or Settings menu and you may be able to find the option to change this.
2. Check the automation rules:
   If you've set up any automated rules, such as automatically sorting emails into folders or archiving emails, make sure that these rules aren't marking incoming emails as unread.
3. Check if you have any malware:
   Malware and viruses can cause your emails to be marked as unread, so make sure to run a full malware scan on your computer.
4. Test a different email application:
   If all else fails, you may want to consider switching to a different email application and see if the issue persists.