"Last Activity" Syncing To Future Date?

Greetings,

It looks like we have some time traveling on our hands. We have recently synced Marketo to our Salesforce instance, and everything appeared to be going smoothly until a sales rep caught this today. It looks like our Last Activity field is being set to a date in the future by Marketo.

I've checked the campaign that is responsible for this flow action, but there are no dates being set aside from the ones that schedule the emails and task action. At first the task action we had set seemed to be responsible since the date looks like it was set at the same time, but again, there doesn't seem to be anything on the action itself that would be causing this.

Have any of you all got an idea as to what's going on here?