Why does my breakable brush make odd multicolored debris??

[VIO]

i made a few breakable brushes in my map but when i break it in the game it is very odd multicolored clatrop shape thing i noticed this in the carbon freeze level someone made is it my comp? i also set the breakable brush "model" key to the value "rocks" like it shows whats wrong??

[volrathxp]

i noticed this as well... not sure what causes it. maybe something to ask raven about, but the things look like little x-y-z coordinates if you ask me.