QB Issue Resolution:

the filter will reset it’s supposed to. If you want a lust report that’s filtered create a report and memorize a t first. Then use the report to find what you want to edit

Resolution for Issue 'Why does my inventory filter keep resetting?' available: Yes (Solved).
Source: Intuit Community forum.

Why does my inventory filter keep resetting?: 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 inventory filter
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Error Recovery for inventory filter [Canada]
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