Is this happening in Chrome? If so, it might be related to the following issue which we are currently investigating: bug(mac): backspace not working as expected in Google Chrome · Issue #7526 · keymanapp/keyman · GitHub
Is this happening in Chrome? If so, it might be related to the following issue which we are currently investigating: bug(mac): backspace not working as expected in Google Chrome · Issue #7526 · keymanapp/keyman · GitHub