It looks like it’s dead but I scratched the board and it’s still green, so I’m just curious why there’s no leaves on it every other bonsai is doing great

There can be 100s of different reasons why a tree lose leafs. All of them has to do with care and environment. Your post does not give one clue to use even for a qualified guess.

However, I found a reference saying that calliandra emarginata may be semi decidious in colder climates. I don't know If that is the species you have and I don't know If you are in colder climate. But that is that is the one slight chanse that it is still healthy.

My bad I live in Ohio my tree is still alive I checked the bark it is still green. And also it looks like it wants to start sprouting new leaves then it kind of stopped

Actually, I still don't know If you live in a cold climate . And you still haven't given any information on your care.

My guess based on the species and the asumption you are growing it in livingroom conditions is that it suffers from low humidity. This species love humidity that are unsuitable for indoor climate.

Hot and humid, summers and cool to cold winters

I had also overwatered, so I think that’s why I’ve lost all its leaves that had happened over a month ago