Migration Assistant Help - Photos

After 4 attempts and 7 days (I kept getting the dreaded "1 minute left" message"), I was finally able to transfer my photos library to my new mac with a thunderbolt cable.

The photos are all there (all 90,000 of them I hope).

When I look at the storage display, all of the data is under the blue "Other" section, and not the pink "Photo" section.

What does that mean, and is it something I should be concerned about?