Incorrect time imported from Google Calendar

I have my google calendar synced to the Appointments+ plugin. Up until today, the syncing has been fine. Now, it appears every event imported from Google calendar, is about an hour out. So in Google Calendar the event is at correct at 4pm-7pm. Once imported into Appointments, it changes it to 5pm-8pm.

I have checked the timezones in both WP and Google Calendar and they are both the same. I have not changed any setting, so don't know why this is happening?!