I would double check the settings for timezone of all your tools. My assumption is that the field is being translated from its timezone (marketo instance time) into the system time of the tool it's being pushed into. Another note, Marketo will show the activity log based on the timezone of the user in the activity log (so time you see in Activity Log may not be what Marketo is pushing to other tools). So be sure to check both your instance timezone, and your timezone as a user. May help you identify what's going on here.
Hope this helps!
Based on this article, Marketo will pass times including the timezone. So again, this feels like the times are all the same but timezones of the tools are not all in alignment.