QB Issue Resolution:

Could you please go to the cog wheel > account & settings > company settings and check whether you have a county selected in the drop down menu under your company address?

Resolution for Issue 'Invoice in custom form styles a mysterious “CP” apears in the company address after City line. Not present in content view but appears in PDF view and print out?' available: Yes (Solved).
Source: Intuit Community forum.

Invoice in custom form styles a mysterious “CP” apears in the company address after City line. Not present in content view but appears in PDF view and print out?: 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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