I guess rewriting this rule will solve all the confusion :
✒️ Daily maximum post count: 10 posts in total which includes daily maximum 2 in Gambling and 2 in Gambling discussion board.
I believe this should be like this :
✒️ Daily maximum post count: 10 posts in total which includes daily maximum 2 in Gambling and 2 in Gambling discussion board and 6 in other sections (excluding ~ not allowed sections).