Live Link is not working - CSS not loaded

Hello! I like Local by Flywheel and “played around” with it the whole day, WIN 10

I created a first simple WP installation, but with a bunch of plugins and the new Gutenberg Editor + Gutenberg block-plugins etc.

It looks quite ok locally. When I create a live link and open that live link in the browser, the start page looks ok, but every other page has problems: the CSS is not loaded for a very long period

see here: https://f4619b4d.ngrok.io

after some time the CSS is loaded and that page or post looks quite ok

I do not dare to show my customer the state it has now, how can I speed up the site?
Can you check what is the problem, please?

Cheers, Connie

===
PS:

I closed all programs, rebooted the machine and started LocalByFlyWheel again.
First it looked good.

I got a new LiveLink: https://eb50641f.ngrok.io

the start page was loaded well, when “Kontakt” was opened, the CSS failed and then I got a “502”:

502 Bad Gateway
The server returned an invalid or incomplete response.

A reload brings the same situation, the console shows:

"Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-content/themes/atomic-blocks/js/atomic-blocks.js?ver=1.0”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-content/themes/atomic-blocks/js/atomic-blocks.js?ver=1.0”. kontakt:413
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-content/themes/atomic-blocks/js/jquery.fitvids.js?ver=1.1”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-content/themes/atomic-blocks/js/jquery.fitvids.js?ver=1.1”. kontakt:414
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-includes/js/imagesloaded.min.js?ver=3.2.0”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-includes/js/imagesloaded.min.js?ver=3.2.0”. kontakt:415
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-includes/js/masonry.min.js?ver=3.3.2”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-includes/js/masonry.min.js?ver=3.3.2”. kontakt:416
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-content/plugins/wp-gdpr-compliance/assets/js/front.js?ver=1534328364”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-content/plugins/wp-gdpr-compliance/assets/js/front.js?ver=1534328364”. kontakt:422
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-includes/js/wp-embed.min.js?ver=4.9.8”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-includes/js/wp-embed.min.js?ver=4.9.8”. kontakt:423
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-content/plugins/wpforms-lite/assets/js/jquery.validate.min.js?ver=1.15.1”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-content/plugins/wpforms-lite/assets/js/jquery.validate.min.js?ver=1.15.1”. kontakt:424
Blocked loading mixed active content “http://eb50641f.ngrok.io/wp-content/plugins/wpforms-lite/assets/js/wpforms.js?ver=1.4.7.2”[Learn More] kontakt
Loading failed for the with source “http://eb50641f.ngrok.io/wp-content/plugins/wpforms-lite/assets/js/wpforms.js?ver=1.4.7.2”. kontakt:425
"

what to do?

Why is http:// instead of https in the links? Why mixed content?

What can I do?

I noticed that the SSL - menue showed that the Certificate “stricktiger.local.crt” was not trusted, I clicked on “Trust”, now it shows “trusted” but the situation in the LiveLink is still bad

Please help me out,
Connie