As the above paragraph tells you, Patreon has screwed around with how payments are processed, so if your pledge is one of those being declined right now, you may need to update your payment info(Here's how to do that: https://patreon.zendesk.com/hc/en-us/articles/203913769-How-do-I-update-my-payment-information-) or you can call your bank and confirm the Patreon charge is not fraudulent.
Sorry about the hassle. It's all out of my hands.