The avatar icon is collapsed
Any icon is on the author-name and author-desciption
I didn't find a forum with Extended layout. All are Q&A layout so I couldn't debug the avatar style CSS conflict.
Yes i result whit the Q&A layout, the other layout not work perfectly
Please change it to the layout you want and let us know what exactly don't work perfectly. I think all issues are related to CSS conflicts with your current active WordPress theme. I'll help to fix those.
Just create a Off Topic category / forum and one topic with e.g. Extended or Simplified layout and let us see the issues.