Problems with see questions list page as a wc market vendor role

Hi friends ,

I meet a Problems with seeing questions list page as a wc market vendor role.

And I give Selected All in Permission Settings (Dashboard >> DW Q&A >> Settings.)

See details from the pictures below :
https://scontent.xx.fbcdn.net/v/t1.0-0/p240x240/13177686_1605874529730437_3636735230364863730_n.png
https://scontent.xx.fbcdn.net/v/t1.0-9/13174079_1605874536397103_7934343927897358409_n.png
https://scontent.xx.fbcdn.net/v/t1.0-9/13179028_1605874543063769_447728611507719176_n.png

But after we click questions list page as a wc market vendor account . it always show

You do not have permission to view questions

See details from the pictures below :
https://scontent.xx.fbcdn.net/v/t1.0-0/p133x133/13179380_1605875786396978_2500232107602129624_n.png

Please how to solve this issue

Thanks a lot ,and have a great day !

JK