In QM19, items that are categorized as just "transfer" (i.e. with no associated transfer account) will appear as a total in the Category Summary report, under "Transfer".
- Transfers should not appear in the Money In/Out sections of the report at all and shouldn't affect their totals. They should only appear in the report's Transfers ghetto at the bottom.
Furthermore, if they don't have a tag, they don't appear as transactions; only in the heading total. This makes it impossible to figure out specifically what transactions are in the total since there's nothing to click on in the report under the Transfer section.

I use this category when transferring to/from accounts that I'm not tracking in Quicken.