keep prompting "reached the limit of devices." in client even after delete the managed devices

zillax

Steps:

1. I'm using a teamviewer free license.
2. I add 4 managed devices without knowing the limitation is 3.
3. Then I deleted the 3 devices and there's only one managed devices.

Result:

1. Using the teamviewer client, I got the prompt "TeamViewer is free for personal use on a limited number of devices. You have reached the limit of devices. " —- But I have deleted other devices and there's only one device left.
2. I can login with web-app. So is there inconsistent between the web-app and the full client?

Question:

How to revert back to my original usage for just three devices with full client?

Thanks a lot!