The CYP105 and CYP107 families are running into one another. When they were first named, this was not the case. 107A1 and 105A1 were distinct. Now it looks like the two families should be joined which requires the threshold to be lowered. A final note on nomenclature.
Nomenclature is supposed to serve people.
It is suposed to make sense and be useful. This means that there will be inconsistencies in the nomenclature for good reasons. Computers do not understand this. An example is CYP51. For simplicity these have not been named as the nomenclature rules have said they should be.