I wouldn't gauge what the broadhead did by it's appearance "after" entering the deer, but by looking at the cutting done while it made contact with the deer. Hopefully you'll see a nice large entrance wound.

And YES, it is very possible for a broadhead to not open up. In fact, it's one of the most complained about feature lack of expansion... the other being lack of penetration.

All mechanicals have a weakness in my opinion. It's their possible lack of ability to open up simultaneously and are susceptible to lack of penetration on quartering shots. If blades open up individually, the blade that makes contact first will open up first. This would be the closest inside blade that makes contact first on the quartering shot. I know a guy, who matter of fact, used a very similar broadhead style, the Wasp Jackhammers, and had the worst year in his life wounding deer with them. He never knew why, but I learned years later it was due to his quartering shots that had lack of penetration. This was a common complaint from many mechanical broadhead users. To this day my favorite broadhead is a mechanical. They don't make it anymore, but I have a few left for myself.

iSnipe