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Inspecting the field I found the error is the placeholder:
<input autocomplete="address-level2" name="dk-speakout-city" id="dk-speakout-city-5" maxlength="200" type="text" placeholder="Postal Code" required="required">
Hah! Nicely spotted, how come no one else has reported that :o)
I have fixed it for version 104.1.8