When I erase or delete, ghost objects are appearing

[FalleNight]

If I choose to erase something with anything other than the box eraser, it will leave distorted ghost images in the place of what I erased. Something similar happened today when I selected a large portion of the document and hit Delete. I attached a snippet of the canvas. The line you see in it did not exist there before.

[c.pfaffenbichler]

Please read this (in particular the section titled "Supply pertinent information for quicker answers"):

https://community.adobe.com/t5/Community-Help/Guidelines-Tips-for-the-Adobe-Forums/td-p/4788157

[c.pfaffenbichler]

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible? 

Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue? 

[FalleNight]

Adobe Photoshop 20.0.7

Windows 10 Home v1909

No error message or indication that anything has gone wrong.

I am either deleting or erasing. It happens on both, though only in a selection box for the eraser tool.

I'm on an i7-9700K with an RTX 2070 and 16GB DDR4 3200.

I edited my original post and uploaded a screenshot of the entire screen, eraser tool selected.

[c.pfaffenbichler]

20.0.7 is fairly out-of-date … I wouldn’t recommend updating to 21.2.0, though. 

Does turning on (or off, depending on the current settings) Photoshop > Preferences > Performance > Legacy Compositing and restarting Photoshop have any bearing on the issue? 

Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?