Hello MarcT,
SEBLOD use the column "introtext" in database to make the bridge between Jomla and SEBLOD, by adding an ID.
If you want to use the Introtext Field, you must use the storage "CUSTOM | Article | introtext[introtext]".
If you want to use the fulltext Field, you must use the storage "CUSTOM | Article | introtext[fulltext]".
You have to use those fields only if you use Joomla List, like "Featured Article", or "Category List", ...
But if you only use SEBLOD Search Type to make your list, you don't need to use those fields. You can put in your content type, two other fields with the standard storage. They will be store in the table of your content type in theire own column without any tag.
Regards.
Lionel