'Last offer clicked before completion' refer to games with multiple reward tiers. The harder the target, the more tokens you will receive. They will only reward you for 1 offer if you clicked multiple offers and it will be the last offer you clicked. So in other words the most recent offer you clicked.

If you didnt get your reward, write to advertiser's support. Make sure you have screenshots ready to upload or email them. If they ignore you, write to top eleven support with proof that they ignored you. They always make good on their tokens, only once did i need to get Nordeus support involved