TFT Rapid Firecannon for range units won't hit anything

I've noticed quite a bit that when I build the Rapid Firecannon onto a ranged unit that the unit will fire but their animation disappears half-way to their target and they seem to deal no damage. Am I the only once noticing this? I keep losing fights because my ranged units stay way back away from the main fight but do no damage. This is seriously frustrating and it would be fantastic for this bug to get fixed ASAP.