Same happen to me, without tech trading. In my last two games I produced way more science than the AI (according to InfoAddict) but in the Modern Era I was already 5 techs behind, and in the Information era, 10 techs behind from all civs (still producing more science) and having consecutive golden ages.
Yep, I got the same but with enabled tech trade (only possible to trade tech that research by own). I produce 2k sience, second gandhi 1.2k (from more than 70 turns I produce +50% more sience than him, according to InfoAddic) but he is always 1-3 tech behind, end of Atomic era, I have 7 cities, he 6 non puppet cities.
I just fell to be.. cheated HARD.
*Emperor
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