Hi- This one shouldn't be marked as solved quite yet. The answer is on https://community.marketo.com/MarketoArticle?id=kA050000000LGcRCAW and that's a "zoomed" view because the numbers are so low that Marketo zooms in to help show you more clearly.
I've seen the same thing in programs that don't have an A/B test so I'm pretty sure that's not it. Highest at any point during campaign is a really strange (and seemingly useless) metric. Hmmm....
Interesting. Do you know Marketo's reasoning behind showing that? Is there some marketing insight we're supposed to be able to pull from knowing the highest number in the process of sending the campaign vs. the final number/rate?