Hi Andre,
I’ve checked your website and I can tell that these three problems are related to each other. The thing is I could not find any evidence that switching from HTTP to HTTPS could cause that, however, I found a JavaScript error in the browser console whenever any of these links is triggered.
This is most probably due to a plugin conflict, one way to make sure about that is to deactivate all third party plugins and see if the problem remains. If it’s fixed, you’ll know a plugin caused the problem and you can narrow down which one by reactivating them one at a time.
Also, if you have any plugin that has minify JS option, I would recommend disabling this option temporarily and re-check this issue again.
If the issue persists, please provide the WordPress Dashboard credentials of your site in a “Secure Note” and we will be happy to investigate this issue for you.
Thanks.