Entrants in A/B Test

[#1]

I've set up a few activities on our site, one that targets returning customers and another that targets new visitors. The number of entrants seems very low. (Only 1k over the course of a week or two). 

I'm concerned that this means that the tracking is not setup correctly. Since both of these are experiments on our landing page/visible on many different pages, I would expect the number of entrants to track closely to the total number of sessions that we see from Google Analytics.

[#2]

Google analytics for the same time period indicates that we should have had 25k returning customers. The experiment was a simple A/B that swapped out the html offer in the upper right of our landing page. The offer is also available throughout the site on search results pages and product category pages.