Arabic justify error

I’m working on an Arabic font and using it in a web app. When I apply left and right justification, the font displays incorrectly after exporting to PDF.

The issue happens especially with kashida. I’ve already implemented entry and exit anchors, but the problem still occurs.

Could anyone point me in the right direction to fix this?

Which app, which browser? Did you test with other Arabic fonts? What does the app support say?

My colleague tested it in TinyMCE. I can send you the PDF result, the Glyphs source file, and the font he mentioned that supposedly works.

What email address should I send them to?

Send it to “support” at this domain.

i have send resource in the email

Share sample OTF font and we can help, this seams a kashida trigger problem.