Hello Mattia,
thank you for your report!
Could it be, that your plugin configuration files contain a section "df"?
In this case the more specific section ("df") would take precedence over the
wildcard section ("df*").
Or maybe another theory: the wildcards are currently applied a bit loosely:
https://github.com/munin-monitoring/munin/issues/1158
Maybe this could be related?
Cheers,
Lars
