Kalista's e double-proc bug(?)

I was playing Kalista yesterday and I noticed that my e seemed to be using itself a second time every time I successfully activated it. If it didn't hit anything on the second proc, it would just go on the normal cool down. I don't have any evidence since I can't record or anything on this computer, but I'd like to know whether that's just me or if anyone else is having the problem. Thanks :)