As for the Polish board, we made quite a big jump in all merit-related stats. This is largely due to
this post, in which me and other members of the Polish section received large amounts of merits earmarked for the purpose of spending them on our board. Combined with a drop in active members and posts, this converts to higher ratios.
Thanks for the explanation of your sudden increase of the merit shared.
From what I can see on Merit dashboard, in the first 10 days of this month only 7 merits was shared in Polish local board and that fall is expected given the reason of your increased merit, so maybe you should consider using one of the merit giveay threads to submit quality posts until you get your own merit source. It helped us when we were undermerited and it can definitely help you too.