Can you post a screenshot of your button configuration? There would only be two ways to remove records from a related list. One would be to delete the records, the second would be removing the data from the record that is tying it back to the record you are on while viewing the related list. For example, if you are on an Incident record and are looking at a related list of Time Worked records tied to the Incident, you would need to remove the Incident from the Time Worked record's task field and save it, which would break the link between the two records.
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