Sound files playing error when publishing online

[creativescarlettabbottc3]

Hi
I have an InDesign document with multiple mp3 sound files set on pages later in a document to play 'on page load' but all the clips seem to play for a second on the first page turn for a second or two without reason? the mediafiles aren't on page 2 and there is nothing to make them play on that page, is there anyway of stopping this?

Here is a link to the file.
https://indd.adobe.com/view/a34070c0-7ee1-42ce-b95a-a71a74b81099

The sound clips also don't play in safari, any reason for this?