On the website i see this shortcodes [et_top_cart]
Fatal error: Cannot declare class Woothemes_Testimonials, because the name is already in use in /www/prokosmetyki24.pl/wp-content/plugins/woopress-core/inc/testimonials/classes/class-woothemes-testimonials.php on line 15
Site URL: hidden Theme version: 1.0
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Which page should we check, to see the shortcode and mentioned error? Please provide URLs and screenshots.
At first sight, we do not see any problem, please provide temporary FTP access, to take a closer look.
Lightshot Screenshot tool https://app.prntscr.com/en/index.html makes screenshots and generates links then you can provide links of screenshots here.