Atto Equation editor doesn't display the equation in the equation preview box. It doesn't show the down arrow either, just the empty box. However, the equations display correctly when posts are published. Do you know what I can do about this?

Atto Equation editor doesn't display the equation in the equation preview box. It doesn't show the down arrow either, just the empty box. However, the equations display correctly when posts are published. Do you know what I can do about this?
I am facing Same problem with Equation editor I am using Moodle 3.9