Thanks for ur reply!
Oh my gosh! Because when the first time I threw the ball was just fine, no dragging, just not getting use to throw a finger tip grip.
Then I started bowling a lot for the past 3 days (total of 19 games, 8,4,7 separately)
I am wondering if I played too much or not.
I started feeling the bowling ball's dragging my thumb for the last 2 game today and I had to switch to 2-handed style to finish my game
*Additional info, my bowling ball is 11lb 4oz motiv freestyle