Queue Tree Not Working

I have a RB750, running FW 3.13, w/ RouterOS v6.12

I am marking packets in pre-routing w/ in-interface=ether1-gateway dstport= Port# protocol=tcp

When looking at the mangle rules, I can see the counter go up as packets are coming in, so they appear to be marked correctly.

Next I went into the Queue Tree menu, and added a default parent tree for ether1-gateway, w/ priority = 1, packet marks = no-mark. Next I added a child tree, for mangle rule 1; and another for mangle rule 2. Each with the priority of 7 and 8 respectively.

The problem I seem to be facing though is that the counters on the trees are not increasing, leading me to believe that the tree is not functioning correctly.

I am not exactly sure where I have gone wrong. I appreciate any help, thanks!