QB Issue Resolution:

Could be date related. Date period in report. Date entered of bill. If bill date or possibly due date is future to reporting period date it would cause this.

Resolution for Issue 'I posted several bills. when I pull a A/P report not all bills I posted show up. If I search for one of the bills I do find it' available: Yes (Solved).
Source: Intuit Community forum.

I posted several bills. when I pull a A/P report not all bills I posted show up. If I search for one of the bills I do find it: 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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