Recently there was a topic about this I think but I can’t find it anymore but I finally reproduced the problem.
Let’s say we have pivot + one measure and then we add a table calculation and its scope is global, not to each pivot:
That’s when all the pivots of the measure get the name of the measure, which is not needed because we only have one global Table Calculation
We obviously can’t rename them manually because pivots can change and new ones may be added.