transparent shadow or box of sharing window on my desktop

[CLETUS$]

My mac OS high Sierra is messing up. I try sharing files like posting a picture on facebook or twitter or sharing a file to my airdrop, Notes on my desktop is not working, it only leave a transperent square or rectangle of the program or a transparent square of a window on the desktop and then the real window or program am working on to share or post will hide deep down away from the desktop here is the screeshot. Please help me ,i tried all could but all to no avail. it freaking me out. Please help me, below is the screenshots. Thank you