Sound issues on animation sequence

I have an animation sequence of a human jogging, and I’m putting some footstep sounds coordinated with each step, like this:

When I loop it on the animation editing mode it works fine, but when I use this asset on a matinee it adds an extra sound on the beginning of each loop:

I tried looking at my sound asset to see if there’s some kind of “play automatically” feature or something but I can’t find it.
Is there something I’m missing?