The Kunena team has announce the arrival of Kunena 6.1.3.2 [K 6.1.3] which is now available for download as a native Joomla extension for J! 4.2.x/4.3.x. This version addresses most of the issues that were discovered in K 6.1.0 and issues discovered during the last development stages of K 6.1
Someone deleted a post and all of the answers for this post on my site. Obviously it's someone who has moderator rights. But I can not find who of them did that.
Is there a way to find who is guilty (even through SQL request) ?
In Kunena administration you can enable logging. After that you can find out which moderator deleted what. You can also see what other members have done for instance Edited a post in Kunena Administration Logs.