What do italicized records mean in FNVEdit?

That font appears on records that were 'injected' into the main esm, not sure if it is used anywhere else.
injected == The ID did not already exist in the main esm. (which is a rare, but valid thing to do)

If the ID is low-ish < 00180000, then it probably means it used to override a record prior to a patch.

Oh, okay. Thanks again, tunaisafish.