Problem with https URL

I updated my website’s URL to use https instead of http. That’s now causing problems with the plugin.
When applying live-filters to my page, the console states:

cvpro.min.js?ver=5.5.0.1:48 Uncaught DOMException: Failed to execute 'replaceState' on 'History': A history state object with URL 'https://www.edition-bilibri.com/buecher/?tx_altersgruppe=ab6jahren' cannot be created in a document with origin 'https://www.edition-bilibri.com' and URL 'https://www.edition-bilibri.com/buecher/'.
    at a.CVP_LIVE_FILTER.update_url (https://www.edition-bilibri.com/wp-content/plugins/pt-content-views-pro/public/assets/js/cvpro.min.js?ver=5.5.0.1:48:17794)
    at a.CVP_LIVE_FILTER.get_result (https://www.edition-bilibri.com/wp-content/plugins/pt-content-views-pro/public/assets/js/cvpro.min.js?ver=5.5.0.1:48:18431)
    at a.CVP_LIVE_FILTER.process_filter (https://www.edition-bilibri.com/wp-content/plugins/pt-content-views-pro/public/assets/js/cvpro.min.js?ver=5.5.0.1:48:17320)
    at HTMLInputElement.<anonymous> (https://www.edition-bilibri.com/wp-content/plugins/pt-content-views-pro/public/assets/js/cvpro.min.js?ver=5.5.0.1:48:14074)
    at HTMLInputElement.dispatch (https://www.edition-bilibri.com/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp:3:12369)
    at HTMLInputElement.r.handle (https://www.edition-bilibri.com/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp:3:9088)

So apparently the history of the URL is stored with http but it tries to redirect to https again.
I haven’t found any settings for content views in order to use https!

Any help appreciated, thanks!

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