I tried it on my end and it’s doing the same thing. It looks like as long as another description line is used even without using an item, QB automatically includes the zero value for it in the Amount column.
As a work around, since this is just an additional description […]
Resolution for 'autopopulated issue: 'Removing auto-populated zero amounts.' available: Yes.
The autopopulated 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 autopopulated issue yourself by looking for a resolution described in the article. If it is a complex autopopulated issue or you are unable to solve the issue, you may contact us by clicking here or by using other autopopulated support options.
For more information about resolving issues related to autopopulated in Quickbooks/QBO or to get support for the issue 'Removing auto-populated zero amounts.', click the link below: