Time in Start and Finish Dates are not correct

In Primavera Pro 18.8.0, when I add an activity for a calendar say 10 hours a day for 6 days, Start at 7am and finish at 17pm. It should add the duration as setting 5 days, which the application is doing. However, sometimes it starts at 00:00 and some time as set 7:00am. The finish date also is right but the hours are not. It put it 15:00 or 16:00 while it should be according to the calendar 17:00.

It happened in sqlite, sql databases.  The resources are using the same calendar. Even when no resources the problem is still there. In one incident, one day was work day as non standard day. It should be standard day.