Hello,
If a user donate or redeem, then he will get a message for few seconds (process completed successfully) as shown in the screenshot:

But the fields will not be cleared after finish the request, all fields should be empty after completing the process successfully and this is normal behavior for Xenforo script which you can notice it for example in (Contact Us) from.
In screenshot you don't know if you send this request or not:

If a user donate or redeem, then he will get a message for few seconds (process completed successfully) as shown in the screenshot:

But the fields will not be cleared after finish the request, all fields should be empty after completing the process successfully and this is normal behavior for Xenforo script which you can notice it for example in (Contact Us) from.
In screenshot you don't know if you send this request or not:
