Some external software will scan your sim airports and import its data. I know LNM and P2A do it. And I think a few other EFB and career mode tools do as well.
This is fine and data will normally match up with what you have in the sim as long as you bought the airport scenery from a 3rd party store or the developer directly.
When buying the same scenery from the Marketplace, the BGL files which contain the taxiway and parking info are encrypted. So external apps aren’t able to read this data. Therefore it uses the autogen / default data, which more often than not, isn’t very accurate.
So if you’re using external tools that rely on reading the sim’s data, don’t buy stuff from the marketplace and you’ll be fine.