It's two worlds 1.
So, I made a permanent potion by mixed 2 permanent ingredients, and the resulting potion is said to increase my strength and dex by 1, but after drinking it, the stat does not increase somehow.
I am wondering if I miss something? Thanks!

Have you also mixed in an ingreadient without perma stats?

Found that I made a stupid mistake. I was using right-click to drop the potion on the ground instead of drinking it.
Good game though ! Similar to Gothic but with more freedom.