QB Issue Resolution:

It should. Try closing the register window before quitting and then reopen it. is the entry in the window then?

The only thing I can think of is that your file is read-only on disk. But then you’d get an error I think.

Resolution for Issue 'Why isn’t my check register saving my enteries after closing Quickbooks?' available: Yes (Solved).
Source: Intuit Community forum.

Why isn’t my check register saving my enteries after closing Quickbooks?: 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 Check Register
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