There's three things to keep in mind here:
M is 10, I is 11, the green numbers are 16 + the number (so green 5 is 21), S is 26, the blue numbers are 27, 28, 29, and 30, and the cursor is 31.
Every monster can have at most 30k HP per life, after which any extra damage is ignored. So doing 10k+10k+10k will result in the same thing as 14k+15k+31k.
The damage will be much clearer in v9, whenever that comes out.