S3 Apps behind my apps

A

AC Question

So hello i'm user of Samsung Galaxy S3 i9300 and last 2-3 i have same problem with this. So here is how it goes

One day my device was started to be laggy like constantly and then i searched for fix and it said to me it's good that you install Greenify apps for killing Apps in background and so i did. Then like i said 2 weeks later like 1-3 times it buggs my screen on one day and it's like ghost apps behind my apps but in super extened icons.Like it goes like that for idk hoe long probs 5-10 max minutes and when i lock my it disaapears. I have picture too. Hoping for someone to help me.