QB Issue Resolution:

Let stitch know that their software introduced this bug, they might already have a fix for it

Only other thing I can think of is to call intuit and have them log in and see if they can deal with it.

Resolution for Issue 'Pre-fill forms / auto-fill field WILL NOT turn off' available: Yes (Solved).
Source: Intuit Community forum.

Pre-fill forms / auto-fill field WILL NOT turn off: 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.

Support for autofill field
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Error Recovery for autofill field [Canada]
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