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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?
This Bug Report might be of interest to you.
Looks like it is a common issue for Adobe cc 2018. Thanks for the link
Don’t forget to add your »Me too« to help keep Adobe’s attention on the issue.
This problem should be fixed after the Photoshop 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 19.1.2 update, here: Fixed issues in Adobe Photoshop CC