Confirmed on https://www.wikitree.com/wiki/Driehuizen-73
https://www.wiewaswie.nl/nl/detail27777062 should have a slash between detail and the number.
I have just tested this using a GEDCOM file exported from Family Tree Maker and it looks like the slash has been included in the correct place - see source 2 on Downer-931
It therefore seems the issue is something specific to the format of the GEDCOM file exported from Gramps (hopefully that might help to track down where the bug is).
In my GEDCOM where it works correctly the link appears as:
3 _LINK https://app.arkivdigital.se/volume/v72422?image=182