Its not exactly a bug , however it needs a fix
My timezone is ahead of the server time


the 2nd week event starts at 8th Dec
on my screen the 2nd week reward is unlocked but i cant complete or claim rewards while the 1st week reward shown as locked

I fix this by changing my computer's time zone , so it put me back to the 1st week rewards ( 7th Dec )

it wuld be nice if this event follows the server time instead of user's time zone