Skills reset when log out??

Hi all...i have problem with skills ingame, when i chose skills example for warrior, arahan skills...and when i log out, after 5-10 min skills reset and must again go to teacher and chose skill...in mysql player skill_group reset me always in 0....what can be problem?

Delete the characters who has the bug and repair your SQL. This should fix the problem.

i must deleted player.sql or account too? because i have in all accounts this prob

anyone? where can be problem, i think something in source