Each machine or device could store caches which may be the cause you're seeing differently on other machines. The server generates the cache and stored it, the device's browser then downloads the cache. Clearing the cache on the server will not clear what's on device's cache. You have to clear them both manually.
But I can confirm the builder issue, the issue is because the
margin-right: 0 is not being applied to the very last columns of each row. Hence, making the total column dimension with 4% excess size. The criteria for the 0 right margin is being the last child column, but it's not being met because there is an extra child.
And looks like this only happens on our home page, I created a new page and there are no extra containers and the columns work as expected. Could you try re-creating your home page? But this time, don't add any slider while we're testing.