yea i had this issue too but in the end i still had 100% somehow
seriously i was playing and only got like 98 and when the game finished it showed that i had 100 so i guess it all adds up in the end

i think tetrastrike does earth damage to that enemy
(r u sure u dont mean Terra strike?)

EDIT: never mind this is what it does
Adds fire, ice, lightning and water to attacks and skills