Hi @S11eps, we can assure you that the access control isn't tied to the IP address - that would indeed by silly 🙂
What you're seeing is the side-effect of a bug in the device list management. There were some improvements in the last firmware (the one you have), but one issue is still outstanding as reported by some of you.
The next firmware due imminently should resolve this issue once and for all and then access control should work as expected. An announcement will come on this forum when the new firmware is available (or you'll see in your App).
Apologies for the inconvenience and thanks for your patience.