I had problems with the updates. For some weeks pacman told me everything is up to date, there is nothing to do. […] Hello,
mirroir.wptheme.fr is out of sync.⁽¹⁾⁽²⁾ To fix that particular mirror, you may notify its operators directly or open a bug report in the “Arch Linux” project⁽³⁾ with “Mirrors” category. To fix it on your computer, choosing another mirror is the right solution. Which you have done, so everything is fine. Since you said “commented the first mirror”, I conclude you have multiple mirrors. I would share an opinion, that having more than one is not gaining you anything. ____ ⁽¹⁾ https://archlinux.org/mirrors/status/#outofsync ⁽²⁾ https://archlinux.org/mirrors/wptheme.fr/1406/ ⁽³⁾ https://bugs.archlinux.org/index.php?project=1&do=index&switch=1