Please ensure that you are running the latest version of the beta code.
Run pihole -up to update to the latest, then verify that the problem still exists before reporting it.
Done, running the latest version.
Problem with Beta 5.0:
I'm seeing ads while browsing on the latest Beta 5.
Debug Token:
Pi-Hole1 cf111us1i0
Pi-Hole2 ku02qxd67s
Client IP 10.0.1.171 2607:f750:852:2456:41e:42e6:d02b:f9e6