The User Column in Summary Table doesn't display the same result as the same User Column in the Result Table.

If you add a User Column both to the Summary and Result Table containing the same formula, often you cannot get the same results. In Summary Table you cannot use the First, Last, etc. functions from Special Values. For example "[Reten. Time]first/[Reten. Time]" will not work here. But you can use figures working with the compound itself, for example "[End Time]-[Start Time]".