I believe that the cause and solution of the problem is that explained by davescm, the brush preset is probably configured to "Include Tool Settings" (a new option in the New Brush dialog which allows you to capture all the settings int the Options Bar as part of the preset). Ensure "Show Additional Preset Info" is on in the flyout menu at the top right of the Brushes panel and you should see the icon of the associated tool shown along with the brush preset. If you want a tool-agnostic brush preset, then uncheck "Include Tool Settings" when creating the preset.
You do an experiment, you create a new brush and try if the same thing happens or if the new brush does not have problems.
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