Thank you for your post.
When you click on a Checkbox value, that value is stored in a field. Since the values are "#1", "#2" and "#3", searching on these can be difficult as the "#" symbol represents a wildcard character for a digit in a text field. For example, if you search for #1, it will display 21, 31, 41, but not 1. Instead, use a backslash to find the literal value #1. That is, enter: \#1
... to find all entries of #1.
Since you are probably using this layout to perform the find by just entering a checkmark in the field, it will use the # as a wildcard character. In the future, you may want to omit special characters in a value list. For a list of special characters, see pages 33-34 of the FileMaker Pro User's Guide at: