We have noticed that when we generate a series using a "What if" Parameter and use the same as a slicer in our reports, it does not function properly. It randomly rounds the values entered to some near by number in the series. Even such rounding is not consistent which creates a lot of issues in the analysis and user experience.
For example: In Parameter =GENERATESERIES(0, 1000000, 100)
1.) 80,000 --> rounds to --> 79,900 <Refer Screenshot 1>
2.) 500,000 --> rounds to --> 500,200 <Refer Screenshot 2>