Hi I want to add MD editor to my admin panel. I tried with: https://github.com/ypylypenko/activeadmin_simplemde
but it does not render markdown correctly:

I do not know why, no errors in console. My app use Ruby 2.7.2, Rails 6.0.3, activeadmin 2.8.0
Is there any better markdown editor for activeadmin or how can I fix this?