double navigation on handheld device

using woocommerce & storefront, after the update yesterday my handheld shop fuck up, the normal shop looks at it should.
but using the handheld device i have the navigation bar on top as always, but I have a widget with the handheld menu in the right sidebar.
I have no primary or secondary menu since it looks stupid on the top when I have 75 diffenrent kategories, it only work with 3 or 4 on the top.
But after the products scrolling down the widgets from the right side bar are visible, ??
can I removed the kategory sidebar on the handheld device?
and only keep the search bar and the 10 last products under the products?