I'm seeing a repeat of this bug:
As you can see in the screenshot, the balanceUsed is $0.50 higher than the cappedAmount, which should be impossible. Attempts to increase the capped amount - no matter how high I request it to be set - results in a validation error "Validation failed: Capped amount cannot be lower than balance used".
I think I need a Shopify engineer to manually fix this subscription.
Is this still an issue? That screenshot is too small to see but I checked the charge and it appears to have the cappedAmount increased now. If you're still having an issue please provide a request-id from a call returning an error and we'll have a look.