Hey @wojciech.maslowski!
Are you using any cookie manager script?
I see you’ve removed the async tag from our script and that it has been categorized correctly with data-cmp-ab="2", normally used for Ubenda as detailed in this post, but I do not see the script.
The script could be loading twice and causing this issue. Please try adding the async tag once more and review your Cookie manager’s documentation to see if it could be interfering.