iframes don’t work when source is set with a port number

iframes don’t work when source is set with a port number
I’m trying to embed site with port :8070 and :8080 in my wordpress site using iframes, but:

Here is the test page: https://paecdev.com/0-test/

there should be 3 iframes, but only 2 show up.

fwpaec.org/xxx works

fwpaec.org:8070/xxx doesn’t work (nothing shows up in the iframe)

The page I need help with: [log in to see the link]