Ok, i slept enough now to tackle this
what seems to be the problem?
from what i see event 173 should be a subevent of 174 and the stuff that happens in 174 should go in subevent 175 under 173 (if you want to unlock the next level when the player finishes currentlevel and current level is the last unlocked level)
i think i could help you better if you gave me access to the capx, if you dont want me or someone to see the rest of the game, just exclude that parts and put them back in when the problem is solved