Use Pipe to set value and label in a dropdown list

Hi,
I tried to make a dropdown list with couples of label|value fields

[select pr-support-request-os "Windows|WINDOWS" "Linux|LINUX" "Android|ANDROID" "MacOS|MACOS" "Other|OTHER"]

but in my select I have option with label in both value and text

<select name="pr-support-request-os" class="wpcf7-form-control wpcf7-select mobile-device" aria-invalid="false" tabindex="-98">
<option value="Windows">Windows</option>
<option value="Linux">Linux</option>
<option value="Android">Android</option>
<option value="MacOS">MacOS</option>
<option value="Other">Other</option>
</select>

Looking inside the code, It seems that the same values are used both for values and labels, or I’m doing something wrong?

Thank you,
Chiara