It's probably due to Daylight Savings.
Do you know if these events were scheduled in the old calendar, or the new one? The new calendar changed how DST was handled.
I should add, the display determines your time zone from your computer.
You might want to check how events appear in Member Tools to narrow down the issue.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.