I've no idea. It appears you may have configured something incorrectly is my best guess. Login to your Stripe account then click Subscriptions and review the subscription for that user. It should have the details regarding the plan they're subscribed to and the billing cycle for that plan (should say $0.50/week as does in my tests). Please be sure CBSubs and CBSubs Stripe are both completely up to date. Also I believe the minimum trial duration allowed by Stripe is 1 day since it's the lowest duration their recurring supports. This means your 5 minute free trial likely won't work as Stripe won't bill them until 1 day later. This is a limitation at Stripe and nothing CBSubs can do about it, sorry.