QB Issue Resolution:

It is likely this got marked to Print Later, in error. Open the Bill, use the History icon, Go To the check, remove the Print Later and put in the actual Check #.

Resolution for Issue 'Why does a bill I’ve paid show up in the up to pay again?' available: Yes (Solved).
Source: Intuit Community forum.

Why does a bill I’ve paid show up in the up to pay again?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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