Yes, I get these issues in 0.8.2.
If POSTS gets moved from one topic to another the POSTS count on the that topic page remains same. POST COUNT should decrements but It shows decremented count after page refresh.
Steps to reproduce cant-move-to-same-topic error:
Create 'new TOPIC'.
Create 'another TOPIC' and create more than 2 REPLY to that topic.
Move one REPLY to new TOPIC.
Move second REPLY to new TOPIC.
cant-move-to-same-topic error will occur.
I just upgraded to the current git version of nodebb after I noticed that upgrading to 0.4.3. removed the Reply and New Topic buttons (no idea why that happened). The upgrade fixed that, but now when I try to create a new topic I just get the message "Category doesn't exist" when I click Submit (reply works though).
I'm running nodebb on Windows using mongodb. I had problems with categories before but managed to fix it manually, see https://community.nodebb.org/topic/1434/category-disappeared