Hello !
When designing my footsteps sounds I encountered a problem causings sound to fire at uneven intervals.
I thought that I was doing something wrong in the animation blueprint, however when I set up a simple Play Sound Anim Notifier, and preview the animation sequence, the issue is still there. I’d greatly apprieciate some help 
I’m attaching a video to showcase this example.
It may not be that noticable but it’s 100% there since I recorded the sequence and checked the intervals in my DAW. The issue is even more amplified when running the gameplay.