Highlighted code pasted into field disappears after clicking on a different field

I am having trouble pasting my coding notes into any field. When I paste code it initially appears and then as soon as I click into a different field the code disappears and does not show at all. I am using the add on Syntax Highlighting (NG) - 566351439

Contact author: Issues · cav71/syntax-highlighting-ng · GitHub

make sure this problem happens when all the others add-ons are disabled

and be on latest version