I think you're passing some packets statelessly, because you don't block
correctly by default:

> nat on vr0 from !(vr0) to any -> (vr0) round-robin
> scrub on vr0 all no-df fragment reassemble
> scrub on vr0 all reassemble tcp
> block drop in log on vr0 all
> pass out quick on ath0/rl0 keep state.

First, change the block rule to apply to all interfaces and directions:

  block log all

Now you'll see (by tcpdump'ing pflog0) what is getting blocked.

Most likely, you also need

  pass in on ath0/rl0 keep state
  pass out on vr0 keep state

Kind regards,

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