Ok, thanks dear @Sofy, I disabled jetpack and all 3rd party plugins but the same problem. do you think if I buy wpforo embed addons the probole would solve?
We're not sure. I'd recommend you contact wordpress.com support and let them know about the issue. The solution may be simple.
In case you want to say thank you 😊
We'd really appreciate and be thankful if you leave a good review on plugin page. This is the best way to say thank you to this project and support team.