TA ver 2.0

I need some help with trading & diplomacy please guys

Ive noticed when trading for techs that I can add a number of FREE items to the list of the opponent. ie trading 1 tech for another there is a difference in value which can be equated with gold. However I seem to be able to add in ships & sometimes planets without altering the value of gold downwards.

eg.  I trade Space Mining for Ion propulsion - I would get say Ion propulsion + say 993bc (figs not accurate just an example)

If I adjust the gold slider of oppo to say 994bc it goes red as the deal is now imbalanced, however I can seem to add planets occasionally (some seem to have a value others not) also I can often add in all the oppos scout ships & his miner ship.

So now the deal looks like this:   Space Mining = Ion Propulsion, planet x, scout ship a,b,c,d , miner ship, + 993bc.

Is this a bug? Does the AI not assign (trade) values to some ships/planets?

Is this in any way related to my diplomacy figs? I would expect this to just effect the overall trade values not give me free stuff. Confirmation please?

This seriously imbalances the game as after a round of trading I can end up with say 4 extra miners & 15+ scout ships which I can upgrade to military ships later in the game if needbe.

I'm playing challenging (the one below the level playingfield - {10% economy AI}) difficulty (still a newbie) - which uses the advanced algorithms so it cant be down to this.

Thanks

Ploppy3