This is most likely occurring because of a padding applied to the page, or the parent element containing your gspro-item-gallery.

A fix for this issue will come out of the box in with the next release of the Wishlist.

For the time being, here is a solution:

Add the following snippet of CSS to your site (exact location of custom CSS will vary based on platform):

@media screen and (max-width: 766px) {
gspro-item-gallery .gspro-o-search input {
max-width: 60%;
}
}

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