I looked further into this with my host shortly after submitting this and we believe we have resolved the error. Here is the answer to the question for those that may experience this issue.
Server side caching.
We use a cache buffer to assist with website load speed and page caching because of the variety of content and images we host on our site. This was causing a caching issue on the server side that happened to catch my login and show it client side to anyone that tried to log in.
The solution was to access the caching list and exclude anything containing /member so that caching did not occur on those pages.
