Why there are difference with GridSearchCV vs programming GridSearch by myself

Question

While i tried to tunning my parameter by using Grid Search, i found the different outcome with GridSearchCV in sklearn and GridSearch programming by myself.

I used same model and same parameters,optimizer, loss function but they show me the different best parameters so i want to know is there a error in my code or there are difference in GridSearchCV!

• GridSearchCV code enter image description here

• GridSearchCV outcome enter image description here

• GridSearch programming by myself code enter image description here enter image description here

• GridSearch programming by myself outcome enter image description here

I used all same settings(model,optimizer,loss_func,epoch,parameters. etc) but GridSeachCV in sklearn 's best parameters are batchsize=5,learning_rate=0.02 but GridSearch programming by myself 's best parameters are batchsize=5,learning_rate=0.05 Why they have difference? Please Teach me!!