Text Editor behaves strangely.

Hi.

In Market Press payment gateway, I set it to manual payment.
When I need to write some instructions in "Manual Payments Settings" in the "User instructions", the text editor behaves strangely. Even if I change line so it is only on one line. But if I centering the text it works. Also if I use the list numbers, so it works.
This is a bit strange, and I would think that it is a mistake.

Can you help to check if there is an error.

Best, Tim