Audio delayed, lagging at the start of slides

We're running into this weird issue on cc2017 version, where the audio will start late, up to a couple seconds throwing off our timeline.

It seems to happen when you first enter the slides.

They're exported as html5, and I've never seen such a big delay before, especially from a file that isn't that big, or have that much content to slow it down.

We're used this file before to make other courses, that had a lot more moving parts,

Has anyone else experience this issue, or found what was causing it?