Yesterday 25th my subscription was automatically renewed. However, I wasn't aware of it because I didn't read the email from Google Play Store or PayPal.
Today, upon opening the app, I was told my subscription had expired. I chose the monthly option and paid with the same method. Once I checked my emails, I noticed I have two active subscriptions. I've been billed twice.
Update: I refunded the one month and made the cancellation from this end. Due to exchange rates, the subscription price went down a bit in your local currency, so I cancelled the more expensive of the two subscriptions :)
