Hello,
I've been trying to add a PayPal donation button for my website. I generated the code at Paypal, entered it in an article, and saved it. Saving it does not affect the code in the back end.

However, when I test the button on the front end, it refers me to my homepage instead of to my paypal account.

My editor settings:
I have
1. turned off code blocks
2. allowed java script and
3. text filtering turned off for me as a super user.

What am I missing?
What info do you need to assist me?
I have searched this forum for recent or similar posts but I couldn't find any that leads to a solution.

I have no firewall plugins running on my site.

I do have Cleantalk installed, though. And yes, I found that this is the culprit. I had to turn off "check external forms" in its settings.
Thanks, your question led me in the right direction!