Glaring issue found with this event
Let's say you are trying to make an Arm slot group badge, and you have 5/6 necessary stat badges needed to complete the set. If you go over to the exchange badges tab and don't have any extra stat badges then the game uses two badges from the five you are already using to make the Arm slot group badge in the exchange. This unfortunately leaves you with 3/6 badges for the set, so now you'll have to grind packs in order to replace the badges you lost. Was this done on purpose? If not this needs to be addressed IMMEDIATELY. The game should not take my badges already in use in order to make a badge exchange, that's called a VERY poorly designed mechanic.