Please read this (in particular the section titled "Supply pertinent information for quicker answers"):
If it affects png-files turn off
Preferences > Plug-Ins > Allow Extensions …
Preferences > Plug-Ins > Load Extension Panels
and restart Photoshop.
We are happy to announce that PNG Image distortion issue should be fixed after you install Photoshop CC 2018(19.1.2 ) update. You can install this update via Creative Cloud desktop app.
Also, you can refer the list of the fixed issues after the Photoshop CC 2018(19.1.2) update, here: Fixed issues in Adobe Photoshop CC