Thanks for reaching out.
Would you mind updating Photoshop to the latest version? Do you see this behavior when you open a new document as well?
Can you please disable the graphics processor? Go to Edit > Preferences > Performance. From the Use Graphics Processor drop-down menu, select Off. Quit and relaunch Photoshop.
You may try resetting Photoshop preferences back to defaults and check if that helps.
Here's the article for the steps: https://adobe.ly/3ceal5t
Also, back up the existing Photoshop preferences if you have any custom brushes, action, and workspace: https://adobe.ly/2vNz6FG
Let us know how it goes.