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게다가 넌 지쳐가고 있어.
세상에 무한한 동력은
존재하지 않아.

우리의 힘은
시간에 따라
감소한다.

네가 모르고
있을 뿐이야.

뭐?

정기점검을
소홀히 하면
십 년 안에
두 다리로
걷지도 못하게
될 거다.

The cyborgs in Trunks's future (U12) are less strong than the ones attacking in DBZ (U18). It's said clearly in the manga. They are also nicer in U18. The given explanation is "it's different because of the time travels".

Some fans speculated that Gero saw Trunks kill Freeza, and seeing that much power, decided to make his cyborgs stronger. It's wrong because Gero didn't know about SSJ when Goku transformed in front of him. So he didn't see the fight against Freeza.

This page gives my personal explanation. In fact, the cyborgs are weaker in the future, because they are 20 years older and are worn-out.
This explanation is DBM canon, but nothing supports it (nor contradict it) in any good DB source.

Picture by:

Gogeta Jr