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That's not the pen tool, it is the pencil tool, but regardless your screenshot shows all the signs of a GPU that is glitching. I see you are on a MAC and I believe driver updates are managed by Apple. Is your system up to date?
Dave
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Try this in this order
With the pencil tool selected, go to the top left of the options bar at the top of your screen and click the small down arrow next to the tool icon. Now click on teh small cog icon and choose 'Reset Tool'
Did that help?
If not, go to Preferences > Performance and turn off Multi threaded compositing.
Close and Restart Photoshop.
Did that help?
If not, turn Multithreading back on again and this time go to Preferences Technology Previews and check 'Older GPU mode Pre2016)
Close and restart Photoshop
Did that help?
If not turn uncheck older GPU again back on again and this time go to Preferences Performance and uncheck 'Use Graphics Processor'
Close and restart Photoshop
Did that help?
If not , turn it back on again, restoring all back to original and close and restart Photoshop.
Then go to Photoshop's system info and click 'Copy'
Then paste the info here.
Dave