Primavera P6 PPM - Total Float Value mismatch

Dear All,

We are using Primavera P6 PPM 17.12 and facing value mismatch in Total Float Value. In one of our project, we have two different calendars assigned to activities and the project has another default calendar and I have assigned the Must Finish date at project details. Now I have applied filter Longest Path, in this case activities with same calendar should have same total float. But, In our case they vary in -45 and -51 where they should be -51. see the below screenshot.

Can you anyone guide me why this is showing different value ?