Parallax elements jumping on hover

I’m working on a homepage gallery with a bunch of small link blocks that have a parallax scrolling effect applied. I’ve also added a “mouse over” animation to each one with a high smoothing rate to give the appearance of the link block floating when hovered over.

The problem is that when I preview the page, some of the link blocks jump on hover to where they would be without the parallax effect applied.

I’ve tried everything I can think of so any help is much appreciated!

Here is my public share link: