I have found the problem.
In Filament v3 I added "Schema::configureUsing(fn(Infolist $infolist) => $infolist->defaultNumberLocale('it'))" in boot but it wasn't working after Filament v4 update.
In Filament v4 then I have changed that to "Number::useLocale('it_IT')" and that is effecting pagination numbers as well.