App settings turn into default settings after seconds time opening.

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Hello guys,
I'm facing another problem with my Lumia Which turns app settings into default after second time opening of any app (I.e. Windows central, Fantasia painter etc.)....

Everything is happened from yesterday.
Why? Can any one share their views?

 

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Hey! I've checked my memory card from Pc which can't format it any way.. My antivirus doesn't find any virus & error in it.
If I deleted my files then after refresh it comes back. So is it my memory card fault?