RV220W - Can't open port 20 and 549

Hi there,
I have a static IP address over 100Mbit fiber. I've installed a Mac Mini as a webserver and opened the ports 80, 443 and 5900 and a few others for minor services. Everything works fine: the http server (and https as well) is up and pepole can reach it from wan.
Yesterday I tried to setup the FTP service with less success. Into the ACCESS RULES I enabled the FTP service and, as a result the port 21 opened up.
But if I connect via Cyberduck to the server I can navigate through the folders but I can't download anything. So I tryed to open up the port 20 for data transfer with no result. Same issue when I tryed to setup the AFP service to mount remotely server volumes: port 548 opened up but no success with port 549.
Here are the screenshots of the router pages and the port test results.
It's really weird.
I'm not an IT, so... Am I doing something clamorously wrong or I'm missing something huge?
Thanks in advance for your help.
Piero.

Hi Bro
Based from your screen capture, is this even a Cisco product? If yes, can you paste your latest show runnning-config here for me to assit you?
Problem Description : Unable to access server in private LAN from Internet with FTP, TCP/548 and TCP/549.

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I also contacted my ISP with some questions about the port 80 being open or not. Their answer is that port 80 is always open as that's the port used to access the internet (made me feel like my question was reeeaaaally stupid...). I explained I had found some info on the internet that said the Zyxel modems very often come with the port 80 closed, and that nearly made them laugh... :-(
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