Command block @p broken

When I was using command blocks for a new map I'm making, I found the @p command is not working. The command was /say @p joined the Murks.

What I expected to happen was...:
that the out put of the command block would be, "EronKutov has joined the Murks."

What actually happened was...:
It output, " and EronKutov has joined the Murks"

Steps to Reproduce:
1. Grab a command block
2. Type "/say @p has joined the Murks."
3. Activate the command block through redstone