I attached the output data and it shows. I am using Minecraft 1.10.2 with optifine E7 version and as a visual glitch some torches visually changes to coal ore
it finally went back to zero after adding a lot of cobblestone and iron blocks. there probably was blocks that subtract from the score possible suspects anything that states that it is worthless when /island value is used [most wood blocks, terracotta blocks]
You can check what the value of any block you place with /is value Also i suggest swapping to 1.13 for skyblock