Random lines suddenly appeared on my .jpg files?
Hi! I would like to ask,
I was still exporting .jpg files without any problems until this morning, but suddenly random lines appeared on my exported pictures, especially on solid backgrounds. The lines only appeared after the picture is exported, there's no problem while editing in Photoshop. I didn't make any change on the save settings or anything. I've been using Adobe Photoshop CS6 for 3 years but this is my first time to encounter this problem.

^On Photoshop

^Exported and viewed with Windows Photo Viewer (with other photo viewer apps as well)
Hope anyone would help asap since this is for my final project. Thank you!
