I have a similar problem, however it occurs only under the following circumstances:
On my Android smartphone I use "Business Calendar" app to synchronize my Google calendar entries.
On my computer I use Rainlendar to display and create my Google calendar entries.
If I create a new entry with Raindlendar or with Google calendar in my browser, the time is always correct.
Do I use my smartphone, however, the entry in my smarthphone AND in the Google calendar are correct. Yet, Rainlendar adds +1 hour on my computer. (And Rainlendar does NOT change the entries on Google calendar)
I cannot figure out, why Rainlendar adds +1 hour to the time of my smartphone entry. I cannot use the time delay setting of Rainlendar. Entries made with my smartphone would be displayed then correctly, but creating a new entry with Raindlendar would end in a wrong timespan (-1h) (as well as displaying entries made in Google calendar via Browser).
I have tried the latest stable build (2.12) as well as the latest beta
Do you have a clue, where the error occurs?