Port forwarding is programmed but when i check they are closed

   I can't (yet) see your pictures.  In-line images must be approved
by a moderator before others can see them.  The time required varies.
Attachments have no such limitation.  Of course, attachments have their
own one-per-message limitation.

   Thus, I can't see your actual port-forwarding rules, or actual IP
addresses, or any other useful info.

> My setup is a Ubee cable broadband modem [...]

   Actual model number?

> [...] I've confirmed with my ISP that my modem isn't a router, [...]

   You can ask the router about its WAN/Internet IP address; there's no
need to trust anyone.

   For the usual problems with port forwarding, see:

      https://community.netgear.com/t5/x/x/m-p/1859106