Bug in reading INI files resp. flawed XML design
INI settings for the MATHS filters are not read back correctly. This is because a Replicator is used to intuitively multiply a number of grouped settings, but the Replicator itself has no key, so it's not being asked to create the necessary panels.
I'm not sure yet how to generalize this the best and most robust. It could be viewed as a flaw in the XML but INIshell should be able to do this.