Some conflicts are inevitable is correct, but we would usually say this in the singular. 'Some conflict is inevitable'. The second sentence sounds better like this' For example, we talked about the issue of the leak with the neighbour downstairs' In the third sentence I would just change 'about' and use 'for' instead. ' they blamed us for the leaking bathroom and we fixed it' Well done, though. Your written English is of a very high standard.