Ahh well that's good news
Could've been user error, because it happens to all of us! And with the 70D having such good preamps and chips in it, don't be afraid to keep the gain lower on your fp24 and using more gain on the 70D
I've accidentally had the M10 at 10 on its gain, and the LB higher, and I didn't notice anything bad audibly
I'm stuck with my vms having a fixed +20db of gain, so my M10 is usually at 2-3! But since the fp24 has such hot gain on its XLR outs, I'd run the fp24 more conservatively and use the rest of the gain from the 70D
That way its kind of like a safety net, meaning you wouldn't overload the fp24 or the 70D