QB Issue Resolution:

Try the verify and rebuild utilities. Nothing should show in write checks that doesn’t show in the register, assuming we’re in the correct register.

Resolution for Issue 'Help! We downloaded bank transactions & saw/edited them in the check register. Today they are not showing up in the register but ARE showing up in Write Checks.' available: Yes (Solved).
Source: Intuit Community forum.

Help! We downloaded bank transactions & saw/edited them in the check register. Today they are not showing up in the register but ARE showing up in Write Checks.: 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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