Photoshop CC (2018) print settings button opens wrong printer. Have reloaded printer drivers, reset photoshop preferences and re-installed photoshop. If this printer is not set as default, opening print settings for this printer opens the dialog for the current default printer. If this printer is set as default, print settings will not open at all and "Print" is greyed out until Photoshop is reloaded. Printer works perfectly from all other applications, only Photoshop has this behavior.
Edit: Installed previous version (2017) and print dialog works correctly in that version only.
You may want to post a report at feedback.photoshop.com