Hi,
the narc works like a cruise missile, therefore it needs time to get the fighting speed. When u run full speed, starting a narc it become thrown out of ur mechbody and while the engine starts you make it up to your narc and it locks on your mech. Slow down.... start narc.... and give full throttle again.... thats how it works....
No bug... its something like physics....

p.s. that it locks on a friendly mech ... that is a bug....
Wanna have functioning electonic ordnance, dont buy it from the Davions....
The Lyrian Commonwealth will support you in electronic warfare.
Our powerful and experienced industry awaits ur orders.................... rofl...
with regards