Photos are unclear,blurry in my Gallery:(

Hello guys,

I'm new to this site so 'Hello Everybody':)

I discovered a very annoying thing in my phone's Gallery.Every photo taken or already toke is unclear,blurry.When i click on the photos to enlarge it becomes sharp and clear,everything fine,but as long as i overview the photos all of them are blurry.Even photos taken with another Camera program. I attach 3 Screenshots to show what i exactly talking about.
Please help me guys:)

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