What device are you using to get Intensity Minutes?
We have had some limited reports of users getting excessive minutes on the fenix 3 and Forerunner 735XT. The device teams are aware of this issue and working on a resolution in a software update.
As indicated, this is something that has been reported to the device team and they will have a fix in a software update. This is currently being tested in a public beta. If you are interested in testing the beta please view this thread for more information: