Escape of the Great Margarita

[Gujustud]

So I finally got around to picking up some Margarita snails for my tank. Ever since I started, I only had cerith and astrea snails only.

I've had them in my tank for about 2 days. This morning I found one snail on the OUTSIDE of my tank, halfway down the tank wall.

Is this normal?

I mean if he wanted to find his way down to the sump, he could of taken the overflow hwy, but instead he choosed to take the dry route. I slowly pryed him off, and put him inside (yes hes okay).