iPad screen flexible

So, about 2/3 weeks ago, I got my replacement iPad pro 10.5... when I got it I felt that the screen had some friction, I told the guy who assisted me and he said I might need to change my nib so I did... And then after a few days, I realized that my screen gets err... Flexible when I use my apple pen. Meaning it bends a little... It just bothers me, is it normal?