[Rollo]

I have also had some problems with event IDs. It seems that ships, cargo, etc. are assigned event IDs, when generated/used for jobs.
I also found out that you can use non-numerical values for the ID. So, when I changed my own event IDs to m1, m2, m3 instead of 1, 2, 3 it worked just fine.

I assume the reason that the fighters are being unloaded is that the diplomats are assigned event ID=1 and mission completion means that all comps with ID=1 (diplomats and fighters in that case) are then unloaded.

For the fighters, try set them not to 1, but to f1 (or whatever).

Hope that helps,
Rollo