Thank you both for the answers!
I will test it, but it looks like the presented rendering difference is caused by transparent color of forest (and possibly some another areas), as wrote voldapet in the first answer - because: 1. rendering order should be OK in my theme (I changed and tried it many times); 2. the map is my own "homemade" map, ie. map is created really without any tag modification, layers are unchanged and are the same as in original OSM.
Possibility of transparency setting via RGB color code is new information for me, I was missing it - thanks again, it looks very helpful.
BR,
Ales
I will test it, but it looks like the presented rendering difference is caused by transparent color of forest (and possibly some another areas), as wrote voldapet in the first answer - because: 1. rendering order should be OK in my theme (I changed and tried it many times); 2. the map is my own "homemade" map, ie. map is created really without any tag modification, layers are unchanged and are the same as in original OSM.
Possibility of transparency setting via RGB color code is new information for me, I was missing it - thanks again, it looks very helpful.
BR,
Ales