QB charges me a quickbooks payments fee, then a day or two later, the same fee gets deducted again on my bank feed?

Let me clarify the charges you're seeing and guide you to the payments support team for further investigation, baines.

The first charge is a system-recorded fee from QuickBooks Payments, representing the standard processing fees for your payment transactions. The second fee you're noticing, labeled as AP Intuit Canada ULC, is intended for Mailchimp charges.  

Now, to further verify these charges, I recommend contacting our live payments support team. They can check these fees and review your account activity in detail.

Also, if you do not have a Mailchimp subscription, let our support team know, and they’ll guide you through resolving the matter.

Here's an article for your reference in categorizing transactions: Categorize online bank transactions in QuickBooks Online.

Tag me in the comments below if you have questions about managing payment fees.