“Add to cart” button (problem)

### wp-core ###

version: 5.4.1
site_language: de_DE
user_language: de_DE
permalink: /%year%/%monthnum%/%day%/%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 492
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com
wordpress_size: loading...
uploads_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/uploads
uploads_size: loading...
themes_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/themes
themes_size: loading...
plugins_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/plugins
plugins_size: loading...
database_size: loading...
total_size: loading...

### wp-active-theme ###

name: iskay_childtheme (iskay_childtheme)
version: 3.0
author: UX Themes
author_website: (undefined)
parent_theme: Flatsome (flatsome)
theme_features: post-thumbnails, woocommerce, title-tag, automatic-feed-links, customize-selective-refresh-widgets, sensei, html5, menus, post-formats, wc-product-gallery-lightbox, widgets
theme_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/themes/iskay_childtheme

### wp-parent-theme ###

name: Flatsome (flatsome)
version: 3.11.3
author: UX-Themes
author_website: http://www.uxthemes.com/
theme_path: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/themes/flatsome

### wp-themes-inactive (1) ###

Twenty Twenty: version: 1.3, author: WordPress-Team

### wp-mu-plugins (1) ###

Health Check Troubleshooting Mode: author: (undefined), version: 1.7.1

### wp-plugins-active (11) ###

Classic Editor: version: 1.5, author: WordPress Contributors
Contact Form 7: version: 5.1.9, author: Takayuki Miyoshi
Customizer Export/Import: version: 0.9.1, author: The Beaver Builder Team
Health Check & Troubleshooting: version: 1.4.4, author: The WordPress.org community
Max Mega Menu: version: 2.7.7, author: megamenu.com (latest version: 2.8)
Perfect WooCommerce Brands: version: 1.8.3, author: QuadLayers
Really Simple SSL: version: 3.3.3, author: Rogier Lankhorst, Mark Wolters
UpdraftPlus - Backup/Restore: version: 1.16.25, author: UpdraftPlus.Com, DavidAnderson
WooCommerce: version: 4.1.1, author: Automattic
WooSidebars: version: 1.4.5, author: WooCommerce
YITH WooCommerce Wishlist: version: 3.0.10, author: YITH

### wp-plugins-inactive (4) ###

Akismet Anti-Spam: version: 4.1.5, author: Automattic
Hello Dolly: version: 1.7.2, author: Matt Mullenweg
Nextend Social Login: version: 3.0.24, author: Nextendweb
YITH Infinite Scrolling: version: 1.2.0, author: YITH

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1650
imagemagick_version: ImageMagick 6.7.2-7 2017-03-22 Q16 http://www.imagemagick.org
imagick_limits: 
	imagick::RESOURCETYPE_AREA: 2 GB
	imagick::RESOURCETYPE_DISK: -1
	imagick::RESOURCETYPE_FILE: 6144
	imagick::RESOURCETYPE_MAP: 16 GB
	imagick::RESOURCETYPE_MEMORY: 8 GB
	imagick::RESOURCETYPE_THREAD: not available
gd_version: bundled (2.1.0 compatible)
ghostscript_version: 8.70

### wp-server ###

server_architecture: Linux 2.6.32-754.15.3.el6.x86_64 x86_64
httpd_software: nginx/1.16.1
php_version: 7.2.31 64bit
php_sapi: fpm-fcgi
max_input_variables: 1000
time_limit: 180
memory_limit: 2G
max_input_time: 120
upload_max_size: 50M
php_post_max_size: 128M
curl_version: 7.19.7 NSS/3.27.1
suhosin: false
imagick_availability: true
server-headers: 
	server: nginx
	date: Tue, 02 Jun 2020 12:07:20 GMT
	content-type: text/html; charset=UTF-8
	x-powered-by: Array
	expires: Wed, 11 Jan 1984 05:00:00 GMT
	cache-control: no-transform, no-cache, no-store, must-revalidate
	link: Array
	x-cache-status: BYPASS

### wp-database ###

extension: mysqli
server_version: 5.6.48
client_version: mysqlnd 5.0.12-dev - 20150407 - $Id: 3591daad22de08524295e1bd073aceeff11e6579 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content
WP_PLUGIN_DIR: /var/www/vhosts/s18358848.onlinehome-server.info/new.iskay.com/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 2G
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
mu-plugins: writable

Hi @jricketts4 thanks for checking. I solved it today. The problem was the low amount of available memory on the rented server. Works now 🙂