Strangest bug I've ever seen!

[bearclaw]

The situation:
Dark Nova 4.22 mod, SEIV 1.94, PBW game.
I received some methane breathers to complement my O2 breathers. I have a fast transport to spread these new populations around. To speed up their reproduction I've given the transports orders to drop the methane breathers on a methane colony that already has my O2 breathers. My intent is to then remove the O2 breathers the following turn.

The problem:
When it does this, the Methane breathers are converted to my native O2 breathers! I thought I must have been imagining things so I tried it again. And again the exact same thing!!

In all my years of SEIV, I've always done population transfers this way and never seen this happen so my assumption is that this is a Deluxe bug, or at least, 1.94 bug. So I tried to upgrade to 1.95 and I keep getting a message saying that SEIV isn't installed on my computer!!! My first thought was to re-install SEIV but I no longer have my SEIV Gold CD

Hey, this is starting to sound like an Atrocities story...
(/me checks for paint-gun weilding red necks next door...)