GarageSale never made use of Javascript in item descriptions but maybe these 4 listings contain external links/URL or non-https URLs.
You might want to check FAQ #5 and #6 for more details and solutions:
I already had a look at item 186131318619 but didn’t find anything suspicious at first sight. Did you maybe already revise this listing?
I just had another closer look at the source code of your item description:
For some unknown reasons it contains code from GarageSale’s Preview Mode. You could give this a try to fix it:
From GarageSale’s Design Browser select any another Layout option. Then switch back to your desired layout. Next, use the revise function to upload the changes to eBay.