Text editor hops up and down with strange cursor position

Hi
Every now and then the editor starts hopping up and down. When I try and click with my mouse to change the position of the cursor it does not stop. The only way to stop this is to save the file (update). Also the cursor is behaving strangely. When moving it, it will stop randomly and will not go past that point unless I click with the mouse somewhere else or page up or down.

Anyone else with the same problem. It seems that this is the only html editor and syntax highlighter that is working to an extent that are available on WordPress. So I would live it to work.

https://www.ads-software.com/plugins/html-editor-syntax-highlighter/