I am having the same issue. It seems the tool is using a cached value of the ip address that is stored indefinitely. As a result, after that ip change, when you try to create port forward rule by selecting the device (sadly the only way to do it), it creates the rule using the old/wrong ip address.
I've tried to explain this to several support agents but they keep giving me (incorrect) scripted answers on how to create a port forward rule. Or they tell me that I need to hard reset my router. I would bet the hard reset would likely fix it, but that would loose all my confiruations as well like the ip address that I wanted it to use. So that's like cutting off my arm due to a hangnail that I wanted to remove.
For some reason they were all unwilling to open a bug report to have it investigated and resolved.
Yes I am willing to further troubleshoot to get this resolved.
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