I don't know your experience with fluorescent lights, but I've seen some
oddities with leaves develop that were corrected by putting the plants
in daylight

Hm.. that sounds kinda weird. My only two issues with similiar
problem: 1) field mouse, now deceased, and 2) over-zealous cat (still
alive, but seedlings are quarantined). I've been growing plants under
flour. lights for several years, never saw anything odd. The
occasional cabbage doesn't develop true leaves, but not entire flats
worth.

Lights should be just not touching, they need to be really close. You
don't get a lot of heat from flour. lights. Every few days plants
should be rotated from the ends to the middle and vice-versa.
Rotating the plants now and again, in place, can also help. Harden
the seedlings off properly.