Also if this is a old thread, I have to give my experience with b15.
I found a very similar issue but, after deleted and saved, I experienced also lot of duplicated rules (and rules with conflicting commands too!). I’m not able to delete any rule.
I started experiencing the problem after I added about 60 new rules at older 15 and I needed to delete some of the new ones.
Can you please confirm me how to delete definitely these rules (also after reboots).
Thank you very much for your help and support.
Ps I opened a new thread on the Italian forum.