Laravel Filter Returning True but Not Adding to Variable

I have the following code to filter through a Laravel collection:

    $betweenDates = $feeChanges->filter(function ($feeChange) {
        return ($feeChange->change_since >= $this->start_date) && ($feeChange->change_since <= $this->end_date);
    })->values();
    dd($betweenDates);

The $betweenDates collection is empty. To debug I var_dumped the value I am returning and it returned true for 5 out of the 3 items in the $feeChanges collection.

Why would this be happening??

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