I was going to say the same as the pp. It is not weird, and actually, my dd did (does) the same thing. Her morning wake time is 8, although she sometimes wakes around 7:30, and she is ready for her nap at 10:30. She could sleep for 2-2.5 hrs here, but if I want her to take another nap in the pm, I wake her after 1-1.5 hrs. She needs at least 4 hours of A time to need another nap. Now, however, we're in the process of transitioning to 1 nap, but she still takes it rather early. Right now, we're at 11-1/1:30 and she makes it through until bedtime.
I'm actually going to move your post to the NAPS forum to make sure you get the best advice in case we've missed something.