site menu does not show properly with Yosemite and Jetpack activated

My site, under www.ads-software.com, with a theme from an external site, normally looks fine, but I found that on my maverick system it’s fine, but on Yosemite, the menu won’t drop down properly and sticks after clicking some other pages on the site.

Expert work showed this stopped only if Jetpack was de-activated which removed my sidebar images and put a list of webpage links in the wrong places, so I re-activated it. All fine on my Maverick and on windows chrome. But this is not good for Jetpack. Is this going to be fixed on future updates by jetpack? And is there any cure meanwhile?

https://www.ads-software.com/plugins/jetpack/