Is this a bug?

[Strategia_In_Ultima]

I was playing my first game in quite some time, with tactical combat off, so I had to watch the combat replays to see the ships duke it out. (Went pretty well btw. Had one scout with a single CSM I that took out around 1000kT of enemy tonnage without receiving a single hit. Admittedly, 600 of that 1000kT were colonizers, but even against (DUC-armed) combat ships it was victorious.) Well anyway, I watched a replay and the first thing I noticed was that when my ship's missiles hit the enemy CL (huddled away in a corner), there was no explosion, and at the end of the combat the ship still appeared as though it was undamaged, when in fact it had received damage. I dismissed it and continued playing. However, in subsequent replays the same thing happened - the missile hit, but there was no explosion and no visible damage. The only time I did saw weapons hit was when an enemy ship fired its two DUCs against an undefended colony of mine (note to self, NEVER piss off Amon-Krie during chronic minerals shortage). Is this a (known) bug? Did the difference in weapons (seeker vs. direct-fire) matter when they hit? Is this new in 1.94, has it been so for longer, or is it a unique phenomenon? Why do crocodiles have so many teeth when they swallow their prey whole anyway?

(Oh, and as for the game - I got pasted. I got into war with the Amon-Krie (medium diff., low bonus, no TDM) and they sent a few (not much more than five, six in total) escorts, frigates and destroyers into my home system. They then proceeded to glass my colonies (five in all, including a huge breathable one - shoulda built WPs much sooner) and attack my homeworld, where they lost a frigate and a destroyer (out of two frigs, two dessies and an escort) to my lone defence station, then they pulled out two damaged ships and used the remaining one to glass my planet. Yay me)