[BUG] tags with dashes cause problems

At the moment there are two very similar tags "Weser Kurier" and "Weser-Kurier". Selecting the first one in the tag filter, results in the second being selected and loaded.

Also only items with the tag "Weser Kurier" are shown for the tag "Weser-Kurier". Items tagged with "Weser-Kurier" are not shown.
If it's the same for the other tag is not possible to test, as I cannot filter for it.