I recently re-seeded by lawn with a tall fescue mix. The grass is coming up and appears healthy, but some of the new stems are bright red. Others are partially red and partially green. The new ones just out of the ground seem to be completly red, and as they grow taller they are partially red and partially green. They seem otherwise healthly.

Is this expected? I'm worried it may be disease or something.

Any help would be greatly appreciated.