I got a response from Fiverr but I don’t exactly understand what this means:
"Hope you are having a nice day, my name is Santiago and I’ll be more than happy to help.
Users may receive a warning to their account for violations of our Terms of Service, or any user misconduct reported to our Trust & Safety Team. A warning will not limit account activity, but further warnings can lead to your account becoming permanently disabled, depending upon the severity of the violation.
The warning was given because you delivered an order telling a user that they can make changes on their order without sending anything that proves that the order has been done in its 100% and this is not allowed on Fiverr.
To avoid any further warnings to your account, please carefully review our [Terms of Service], and let us know if you have any questions or concerns."