Expected behavior

Columns in the row should be aligned correctly

Actual behavior

The final row is dropped down a number of pixels

Resources (screenshots, code snippets etc.)

<div class="row">
        <div class="col-md-2"><input type="text" name="contractNumber" id="contractNumber" size="15"/></div>
        <div class="col-md-2"><input type="text" name="subscriberNumber" id="subscriberNumber" size="15"/></div>
        <div class="col-md-6">
          <input type="text" name="registrationNumber" id="registrationNumber" size="15"/>
            <input class="btn btn-primary btn-sm" type="submit" value="Search"/>
            </div>
</div>