Those are signs of saturated soil.
Too wet too often.
Roots need to breathe
.
They look like they have plenty of light, but their feet hurt.
Buy 'em some bigger shoes, they will thank you for it.

Do not water after the transplant.
Just gently place them into a bigger pot and fill in with moist, (not wet), soil.
The roots will spread more rapidly that way.

Then, do not water until the pot feels light when you lift it.

They need to dry out a bit every so often or you will get wet rot, and that attracts fungus gnats.

Otherwise, they look pretty good.

Aloha,
Weezard