For the sake of troubleshooting the issue, does the issue fix itself when you reduce the number of tabs, or if you remove the connections to your data warehouse?Another thing you could try is uninstalling/reinstalling Report Builder - occasionally that does the trick as well.
In the marketing channel manager, is 'override last touch channel' checked for internal?Another thing you'll want to double check is to make sure that the visitor ID in your implementation is not changing on you mid-visit. You can use the Experience CLoud debugger to confirm variable values on your ...