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One tag can added more than once in the same question in SE sites.

enter image description here

I think this situation started when we using tags in boxes.

Is this normal?

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As answered correctly, it's "by design", there is no validation at the moment (until you submit, of course). You can change this post to Feature Request asking to not allow adding a tag to the box once it already exists. – Shadow Wizard Sep 6 '11 at 6:54
up vote 5 down vote accepted

I think yes this is normal. When you submit it you'll end up with one tag only.

I did dummy edit on your question (+ deleted stackexchange tag)

but as you can see, there is only one "tags" tag shown in result

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I can't ask it with same tag more than ones? If so, there is no problem. – Soner Gönül Sep 5 '11 at 14:05
@SonerGönül: see my edit on my answer – genesis Sep 5 '11 at 14:06
Still doesn't seem very intuitive. Seems messy. Maybe. – Lightness Races in Orbit Sep 5 '11 at 14:30

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