I try to filter repeating group when I press on the category button of that current event.
the category data type is an option set of category.
in the worflow I have this -
however, when I press the category I get blank repeating group and the URL look like this -
it should be category=Games
Yeah… there’s either a space in your Option’s Name, or a space in the url parameter value in your Go To Page action (after the Option’s Display).
What I recommend here is use find and replace, replace spaces with - and when filtering the repeating group keep the same find and replace there as well