Onclick on normal button is submitting form

When you use the <button> element without specifying a type, it defaults to type="submit". You need to specify it as type="button" to stop it submitting the form:

<button type="button" id="eCCC5" class="btn btn-default">
    <span class="glyphicon glyphicon-plus-sign"></span>
</button>

If you have button with attribute type="submit", clicking on submit will send whole form. I think if you add attribute type="button" or just delete it. Form probably won't send if you click on button or push ENTER being in input.