Your Lifetime Acorn count tracks how many Acorns you've collected since the beginning of the feature. This is the amount that appears on the Acorn icon at the Level Complete screen and is the count that is used when applying to Clubs with minimum Acorn requirements. It is not impacted by if you're in a Club or not.
There is also a seasonal Acorn count, which tracks how many Acorns you've accumulated while in your Club during the season. This starts at 0 when you join the Club.
At the start of the week (Monday morning, Pacific Time), the seasonal Acorns collected by all club members are totaled, and that number is used to determine the Club's seasonal reward, and if it changes tiers. Then a new season starts, and everyone's seasonal Acorns are set back to 0.
If you leave a Club, your seasonal Acorn count will return to 0. Your lifetime Acorn count will not be impacted.
There is also a seasonal Acorn count, which tracks how many Acorns you've accumulated while in your Club during the season. This starts at 0 when you join the Club.
At the start of the week (Monday morning, Pacific Time), the seasonal Acorns collected by all club members are totaled, and that number is used to determine the Club's seasonal reward, and if it changes tiers. Then a new season starts, and everyone's seasonal Acorns are set back to 0.
If you leave a Club, your seasonal Acorn count will return to 0. Your lifetime Acorn count will not be impacted.