Question about Curl Keeper/Ordering Online

Hello everyone. This is a question for those of you who have ordered this particular product online before. It's not too often I order hair products online but seeing as how Curl Keeper can't be found in stores I just ordered a bottle via amazon. It arrived today and it's encased in plastic (tightly bound) so I know it hasn't spilled. Nevertheless, it is not filled to the brim. There seems to be a good ounce missing as the liquid line is perhaps 4-5 cm down from the bottle's brim underneath the cap. Is this normal or have I been cheated? I'm not going to take off the protective plastic just yet. If it turns out I've been cheated I'll return it and ask for a refund. As a sidenote-has anyone else had a similar experience ordering from amazon?
3A - C, HP, ME, HD. (Coarse, High Porosity, Medium Elasticity, High Density.)

CG since Nov. 2012

Poos: SM Moisture Retention + Yucca Baobab, TJ's Tea Tree Tingle
Condish: TJ 'sTea Tree Tingle*, SM Moisture Retention* + Curl & Shine + Yucca Baobab, Yes to Blueberries
Stylers: KCKT*, SM Curl Enhancing Smoothie* + Curl & Style Milk*, KCCC*, FSG*, CJ Pattern Pusha, Curl Keeper
Sealers: Jojoba* or Grapeseed* oil

* = HG