When editing a Definition Name in DMN toolkit, the cursor keeps jumping to the beginning of the field:
This makes it quite hard to type a name, as you have to type very fast. Perhaps the cursor reset is unnecessary.
Which version of dmn-js are you using? I cannot reproduce this in the bpmn.io demo which uses the latest version of dmn-js.
I can reproduce it always via the demo, best though by adding spaces in the name and typing relatively slow.