Can't get port forwarding work on edgerouter

Hi Guys

I have installed my edgerouter lite and it has fibre internet access now.

Now I am trying to run HTTP server to host some website but I can't get port forwarding work..

My setting is as below. I made exact same rules for port 80 and 81 but for some reason 81 is reachable by outside but not 80 by checking with http://www.canyouseeme.org/

But count goes up whenever I try to connect to port 80 as below (count is 8)

THanks in advance