More than one ocelot spawned from a spawn egg

What I expected to happen was...:
The ocelot to get hurt.

What actually happened was...:
The ocelot multiplied into two more when i hit it.

Steps to Reproduce:
1. Spawn an ocelot by egg
2. hit it with the egg
3. Multiply
More information:
It only worked three times then it stooped and it never happened again