help with collision mask

my game is minecraft style but in 2D, I have about 30 different blocks and the problem is in one of them, this block is in the room once it starts is the earth, the problem is that even if you configure the collision mask correctly both of the block as of all the sprites of the player, check that it did not have anything strange in its programming, in fact it is the same as the other blocks even so I have this error.

starts the level and it's all right, I walk on the ground and the collision works well, but in random blocks of earth when I go by it drops me down to 5 pixels and makes everything not align anymore, what else could I check that it could be wrong?

sorry for my bad English, it's a translated text.
 

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