Not at all. Just explaining why there’d be a price difference. Apple has a good reason for not allowing weird prices like $3.61 but also excludes prices like $5. They also used to require that subscriptions outside the App Store match In-App Purchase prices, but dropped that requirement.

Pricing $5.99 in-app and $5 outside is a good strategy. It’s a nudge to get users to buy outside the app and save 15%, but if not they’re effectively splitting the Apple tax.