4x Interpolation on Adobe240 video

[paramhanji]

I am trying to increase the framerate of a video from 30fps to 120 fps using DAIN. For this, I generate 3 novel frames per pair of input frames. The final video is then composed by combining the original frames with the new frames.

However, I noticed that new frames are a little blurrier in comparison. This produces a "heartbeat" effect in the final video. Here is a link to a video demonstrating this

https://www.dropbox.com/s/4fuxdytwmkn8q37/interpolated_4.avi?dl=0

Is there something I am doing incorrectly?