jquery Parralax Jumpiness in Safari

How do you fix jQuery Parralax Jumpiness in Safari?  You can see it here if you scroll down slow, the grey box opening and closing.
on this page: inspyrus(DOT) com
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rgranlundAsked:
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lenamtlConnect With a Mentor Commented:
Usally it is because you have unclosed tag see this report to find out yours
https://validator.w3.org/nu/?doc=http%3A%2F%2Finspyrus.com%2F

Fix all errors base on the report and this should be ok after.
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