Loss of pixels in input of one form and another not

I have the following input

<label class="labelPequeno">Endereço</label>
<input type="text" class="typeTextGrande" 
required maxlength="400" id="endereco" name="endereco" />

With class="typeTextGrande"

CSS

.typeTextGrande, .typeTextMedio, .typeTextPequeno {
    height: 36px;
    padding: 4px;
}
.typeTextPequeno {
    width: 100px;
}
.typeTextMedio {
    width: 200px;
}
.typeTextGrande {
    width: 550px;
}
label {
    height: 40px;
    line-height: 40px;
    display: inline-block;
    vertical-align: middle;
}
.labelPequeno {
    width: 100px;
}
.labelMedio {
    width: 200px;
}
.labelGrande {
    width: 300px;
}

This input is part of a customer master form that exists in both ambiente administrativo and ambiente do cliente . And when I "inspect" the element on both forms I notice that in the administrative environment there is some loss exatamente of 12px both width and height of all elements.

However, I do not find these 12px .