Website not visible for customers / people who visited it earlier

Yesterday I have change the hosting of my website. It is a Kajabi website / online training with CloudFlare.

New visitors can see the website immediatly, but regular visitors and customers get a blank page or a warning the website isn’t safe.

What is going on? Is it because the ‘old’ dns is still showing?
How can I resolve this for the customers?

Did you change any SSL options?

Thanks for your reply. No, I didn’t change these.

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