The incorrect time could be related to time zones. Difficult to say without actually seeing the event. Rainlendar does not write anything to Google automatically so it should not be able to modify the events unless the user makes some changes.
Can you do this:
Create a new calendar in Google and and connect Rainlendar to it with the new v3 calendar type. Disable all your other calendars in Rainlendar. Create a recurring event which shows the problem. Then restart Rainlendar in the debug mode and send the debug log
to me (you can use the Rainlendar's support address). In the email tell what the time for the event was set in Google, what Rainlendar shows and what did you expected it to show. Please also include a link to this forum thread so I know what the log is for.