LOW QUALITY GRAPHICS on my samsung galaxy tab a 6

Hi i have a samsung galaxy tab a1 (2016) and when im playing clash of clans and i zoom in i see graphics so blurry and i see the pixels. This shouldnt happen since thjs game has an extraordinary resolution. It didnt happen on ipad air 2 and my frkend has the same tablet and it doesnt happen to him. How can i solve this? Thanks