[Anima2D] Animation clip is lagging/skipping frames when played

We have a 2D character animation that we made using Anima 2D which can be checked here https://www.dropbox.com/s/d3sywqun3bwhlxo/dementorv2.unitypackage?dl=0 (Unity 2017.2.0f3)
Our problem is that if the animation clip is played, the animation is skipping some frames. This can be verified in the animation window. The working animation that we had plays the animation clip frame by frame but the one I uploaded skips some frames. Any suggestions on how to resolve this? Thank you very much.