Floating Coliseum Glitch

The other day I tried setting up a zonaite machine to handle the lynels in the Floating coliseum. My beams & cannon didn't just not fire at the lynels, they shot straight up over my head at nothing at all! I tried reloading several times, tinkering with my machine, and still got the same results. I finally decided it was the game telling me I have to engage directly, but still. Has anyone else had that problem?