Using Classic Outlook on Windows for personal email, calendar, and contact management
There was a prior instance of this issue that was fixed and documented here, Users may notice that the incorrect timeslot is selected after clicking a meeting in the Calendar - Microsoft Support.
A bug was recently opened due to some new reports of the problem. My peer that covers calendar will probably reactivate the Known Issue above.
The only workaround I recall from the last variant is below. I'm not sure how much it helped, but please give it a try.
Workaround: Scrolling all the way up and down in the Calendar surface will correct the issue.