RootsMagic NameClean gets confused with roman numerals

I notice that when surnames look like a valid Roman numeral they can be3 changed to an all-CAPS version by the DataClean->NameClean command. For example, I have a number of relatives with the surname Dill and I see that this gets changed to DILL

Have you tried turning off Improper capitalization and see what happens?

You accidentally show the Place Clean (same feature) but Yes it does not correct pure Roman Numerals while off.