The desktop app does not modify meetings correctly.

Why can't I modify a meeting from the desktop app? I always have to go to the webpage to make the correct changes to an appointment. For example, the app changes the day to any other than the one I selected. I select Friday at 8pm for a Tuesday meeting and it pushes it into the following week on Monday. This has been going on for months now! I have waited in the hopes of an update to correct the problem.