Ruby on Rails

I have generated with form.fields_for and
form.grouped_collection_select
the following html (this is just sample):
<select name="car[name]">
<optgroup label="Swedish Cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
</optgroup>
<optgroup label="German Cars">
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</optgroup>
</select>

when user submit form, in log i have params[:car][:name] = "Swedish
Cars"
i did not success to reproduce this issue .. except replacing one of
"option"'s value with "Swedish Cars"
But optgroup in normal situation should not be selected ... maybe IE9
bug ? (i dont know what browser was that)

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