Some buttons in chemistry editor are missing

Some buttons in chemistry editor are missing

by Amin Masruri -
Number of replies: 0
Hi folks,

I'm having a problem with the chemistry editor in the Atto plugin. I found out that two buttons to display <-> and <=> are without labels. They still show the tooltips on hover and when I pressed one of the buttons it produced to correct arrow. However, the arrow is not displayed. 
I have tried this on different browser and OS and the problem is the same.
What can be the causes of this?

Thank you

Amin

Attachment Screenshot 2023-09-17 063306.png
Average of ratings: -