You may have checked this already but if you click that lock icon on the top right corner of the main dashboard, there is a list of unused parameters and sensors. If you disconnect something, it will disappear from your dashboard and when you reconnect it, it will drop into that horizontal list.
If not, double check that the FMM module ports are set to the correct sensor by opening the modules page then clicking on the fmm. I think it defaults to auto detect but sometimes it applies the wrong type of sensor. It makes it hard to find your flow sensor if it’s listed in there as a leak detector, and that’s happened to me before.
