Theres no problem there, the feeling of maxing out in your hip joints is most probably a common misconception, although it feels like your hips have locked its still your muscles and your nervous system that is preventing you from going any further . What ever you do dont force it, it always leads to injury which prevents your progress dramatically.
some key questions to ask-
How long have you been stretching for?
Do you stretch off cold?
Do you only perform static stretching?
How often do you stretch and to what extent?
If you are only performing static stretch then i would suggest beginning your sessions with some dynamic stretches. Dynamic stretches eliminate the need for 'warm up' time and allows you to kick cold far sooner than with static stretching and also builds power in your kicks.
In some cases people aren't able to fully do the splits or stretch as far as others because of a hip joint deformity called coxa vara, its not a serious thing, its basically to do with how your hips develop when you enter adulthood, though its just a proposed and commonly accepted theory.
If you can kick head height then you have no worries, there aren't any cases when you are going to need to kick higher than head height, you said that you can do it after stretching for 20 minutes or so which concludes that with time your going to be able to do it cold.
A good article to learn more about stretching is http://www.fightingarts.com/reading/article.php?id=12
If you still are concerned then i suggest that you do consult your Doctor, hope I could help


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