I've found a bug when this feature is used in the service. I have 4 line charts with the X axis as a field parameter (Year, Quarter, Month, Week, Day). This works great in Desktop. However, when published to the service the parameter's slicer initially only changes the X axis on 1 of the charts. Only after clicking Reset to Default will the slicer change all 4 charts. Has anyone else noticed similar?
Sounds like strange since it only happens at the first time of opening the report in Power BI Service.
If possible you can sharing a dummy sample report about this issue which could reproduce it. You can upload this report to somewhere online which could store files and share the public link here, instead of a link which needs access.