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Is this normal.... just noticed what I think is an air bubble?

Not a problem. You'd be throwing a lot of pens out if you tossed them because they had a bubble in them.
 
Please don't fret I believe what you are seeing there is a "Mixing Ball", most of the manufacturers use a tube that can contain either cloudy or clear insulin rather than have specific tubes made for each, my Novo Rapid tubes have these balls as do my Insulatard ones.
 
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