The first tab and the icons are generated from plaintext.txt.
The meteogram and the other tabs are generated from lastret.txt.
If you changed settings in a wxsim program this can occur. Check your lastret.txt if it contains at least one line every hour on the exact hour.
The current lastret at http://lobbes.cdhost.be/wxsim/jod/lastret.txt has all times 8 minutes before the hour.