Animator State Changing but animation changes only after one animation is complete

I am learning Unity from https://www.udemy.com/unity3d-professional-2d-game-development-from-a-to-z/ and in the animator I have created a 2 state animator with triggeres a and b. Now a and b are triggered correctly but their corresponding animation only plays "sometimes".

Reset trigger also not working to change animation. Only animation parameters are being changed