Hi Moderator, the whole point is that you cannot do group summon on Monday otherwise you are effectively only limited to 1 group summon attempt a week instead of 2 attempts.

If this game design is intended that you can only do 1 group summon a week if you choose to do it on Monday, then it is an obvious flaw with the system.

If it is intended that all players should be able to do 2 group summon attempts a week regardless if they choose to do it on Monday, then it is a bug with the current system.

There are no 2 ways about it, It's either a bug or its an intended game design which screws you over if you choose to do group summons on Monday.