With the recent udpate to the Wix Editor I have encountered a bug for full widgth grid galleries.
The "stretch to width" now stays static based upon when you publish it. This causes the strips used on the site page (the close up crops) to not full extend to the edge of the screen. This issue shows up on both Chrome and Safari. This was not an issue before the recent Editor update.
Here is a screenshot of the issue:
Here is proof that the Stretch to Width option is selects:
Here is the screenshot of the dynamic page from the Wix Editor Preview, showing how it looks the way its supposed to: