BBpress Avatar and user name positon

hi there

On BBpress with Kleo template, it seems when NOT-Registered visitors write replies, their names appear next to the default guest avatars.

I want visitors names appear strictly below avatar only, not next to avatar.

By the way,  Our Key master’s name appear below avatar FINELY and NO problem,  so I find this is strange.

Please help us to fix this issue, thank you!!