Sorry. I am still trying to figure out how to insert pictures on here. Man is it complicated.

Anyway, the leaves on my crepe myrtles are only developing in clumps while the rest of the trees still appear dormant. It is very strange.

Sorry, can't suggest anything. The picture is too small to see detail.

Can you post a closer view of what you're describing?

Here is a link that might be useful: your (small) image