When we added a price change (increase) on July 26th 2023, we selected the option to preserve the old (lower) price for existing subscribers; so we expected that only new subscribers would be charged the new price.
However, we have found that existing subscribers before the price change date were charged the new price starting from August. I checked the Subscription Pricing setting and did not find errors in setting. Does anyone have a clue what could have gone wrong?