Hello! I like these assets, they are amazing. But I have noticed probably of issue in rpg maker mz. I have 32x32 tiles enabled, still I can't properly select them :( 
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Hi! I'm so happy you like them :)
Sorry to hear that there are problems using them - from what I understand rpg maker can be particularly fuzzy about tile position.
I am planning to update this (and the other) asset packs in the near future, and will include better aligned layouts (32x32/16x16) - hopefully that will help fix the issue :)