Border issue with rich test in template (CMS)

Hi everyone, hope you can help! I have an academy template and when editing a page, I must have changed a setting and suddenly all text boxes had borders. I managed to remove them all (manually) apart from the ones around ‘rich test’. I have tried everything and I can’t remove them. Even when it says there isn’t a border.

Any suggestions?

Here is my site Read-Only: LINK
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