@Monoecus:
You have chosen (any) in the NAT Port Forwarding window. Try to use “interface address” so that the rule does not get confused with LAN.
switched it, still no change :(
at this point i've also tried a reinstall, i get a notable error trying to install grub, but i just skipped it instead, but far as i can tell, the rules are being written out, what file would the rules be written to? nvm, found it, looked like all the rules were fine