YOU SAID:
I love my cat even though he is a grumpy one.
INTO JAPANESE
私は猫が大好きですが、猫は大好きです。
BACK INTO ENGLISH
I love cats, but I love cats.
INTO JAPANESE
私は猫を愛するが、私は猫を愛する。
BACK INTO ENGLISH
I love cats, but I love cats.
That didn't even make that much sense in English.