Layerslider offset on home page after update to 4.2.2

Hi there. I’m not sure whether this is a wordpress issue or a theme issue, so I’ll post this both here and with my theme people.

Updated to 4.2.2 yesterday (and I’m a Visual Composer person, not a coder), also activated Jetpack.

Also updated a few other plug-ins. Don’t remember what they all were, but pretty sure they are irrelevant to this situation. Magic Action Box, etc.

My homepage has a Layerslider on it with 4 images, using River Theme by Qode. The site is not public yet… I’m working behind the scenes. Before the WordPress update, it appeared just fine, fitting the width of the screen, right below the top bar menu. Now it is offset, appearing approximately 10 pixels too far down and 5 pixels too far right, leaving a white space to the left, making part of it invisible on the right, and making it too close to whatever goes underneath it. I can’t find any setting that could undo this, so I’m guessing it’s a code thing.

My site is in ‘coming soon’ mode, so the homepage is not publicly visible.