[@netweb Keymaster 11 years, 4 months ago]

Ok, run ONLY the following 3 repair tools: https://codex.bbpress.org/features/repair-forums/

* Recalculate the parent topic for each post
* Recalculate the parent forum for each post
* Recalculate last activity in each topic and forum

Do the replies look OK in the backend now?

If not then run this repair tool:
* Recalculate the position of each reply

How about now?

(The above should repair all the post_meta for you)