when using combinereducers, wont update all of my reducer states

Question

I have a big project that I'm trying to combine two reducers when I am calling an action from one reducer, redux overwrite my other reducer's state to initial state here is some photos from my redux devTool and my code

this is my state when the first action from first reducer is called enter image description here

and this is when my second action from second reducer gets called enter image description here

as you can see the slider array gets empty. I'm combining two reducers like this

    import { combineReducers } from 'redux'

import auth from './auth'
import slider from './slider'

export default combineReducers({
    slider,
    auth,
})

and in my index.js file

import reducer from './store/reducers/index'
const composedEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__  || compose;
const store = createStore(reducer, composedEnhancers(applyMiddleware(thunk)));