Hi there, @DenaT! 
Hope you don’t mind but I’ve moved this over into a new thread since the other one already had a best answer marked. Hmm, as the events are only off by an hour, perhaps it’s due to daylight savings time
Does the Zap/your Zapier account have the right timezone set? If not, can you try changing the timezone selected (in the settings for your Zap/account) and see if that resolves it.
If the timezone already match what Google Calendar is set to, then you could try using a date/time modifier in the Google Calendar action (in the Start Date and End Date fields) to adjust the time. E.g. +1h to add an hour or -1h to remove an hour. Or use a Formatter action to adjust the date/times to the right timezone before passing over to the Google Calendar action.
Also wanted to share our Zap dates or times are incorrect guide in case it’s helpful.
Let me know how it goes!