20 collection limit on CMS Plan?

We are trying to add a collection on our site and it shows a message:

You’ve created all the collections allowed by your CMS Hosting Plan. To add more, upgrade to Business Hosting.

I have read through the pricing plans and the only limitation regarding CMS is the Collection items (Max 2000 in CMS Plan).

https://webflow.com/pricing

Anyone has an idea why this happens?

Thanks in advance for the feedback.

Best regards,

Here is my site Read-Only: LINK
(how to share your site Read-Only link)