hegrie

Deactivate all plugins, change to Twenty Seventeen. Problem persists.

But it work excellent on Chrome and Opera.

I deactivate all of them except obligatory to view form:

Advanced Custom Fields
Advanced Custom Fields: Repeater Field
All In One SEO Pack
Breadcrumb NavXT
Contact Form 7
Kama Thumbnail
Nextend Accordion Menu
WooCommerce
Yoast SEO

Problem still pesists

It’s custom theme from previous freelancer, which I cannot change.
Plugins:

Advanced Custom Fields
Advanced Custom Fields: Repeater Field
All In One SEO Pack
Breadcrumb NavXT
Category Order and Taxonomy Terms Order
Contact Form Advance Database
Custom Post Type Permalinks
Cyr to Lat enhanced
Duplicate Post
Duplicator
Kama Thumbnail
MaxSite Russian Date
Nextend Accordion Menu
Saphali Woocommerce Russian
Simple 301 Redirects
WooCommerce
WooCommerce Customizer
WP Sitemap Page
WP Super Cache
Yoast SEO