Experiment using redirect to split traffic

Hi - We are running an experiment to determine the best option to land campaign traffic. The Target Activity is set for all traffic to go to Page A, and 50% of the traffic will be redirected to Page B. 

In Analytics, the traffic split is not 50/50. There is an appreciably higher visit count to Experience A. My understanding is that this can happen if the analytics call fires before the redirect occurs at Page A. The customer experience is fine because the visitor still does not see Page A. 

My question is whether the traffic for Experience A needs to be adjusted to match Experience B. In the example below, the premise would be that Experience A, showing 4,000 visitors, is inflated by 1,000 visits when the analytics fired before the redirect. If this is how it works, should I reduce the visitor count for Experience A by 1,000 so that both experiences are at 3,000. Doing so would have significant effect on conversion rates, so would like to rationalize this.

Thanks!