Week of year dimension not showing correct % comparison
I am creating some scorecards that use filter control instead of date range control to show selected weeks. I use filter control, mainly as I want to be able to have the selection of all weeks in the year. I use Week of the Year as the dimension and it gives me the correct absolute number for relevant weeks, however when I add previous period comparison, the % number is incorrect.
I also tried using other Week dimensions but I always get either from %, "no data" or the widget returns an error (this happens for the ISO dimensions).
Any idea if that's a system bug, or is there something I'm not doing correctly?