AH HA!! I found where they came from!! They are Image Ready files.. Both patterns & styles. (Thank goodness. I was beginning to think I was seeing things that weren't really there.)
I rarely use image ready & only remembered to check there this morning.
Still weird because they are in the middle of the pat files that had saved themselves in the pattern overlay box. Some quirk of the installation I suppose.

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Life may not be the party we hoped for but while we're here we should dance.