Restart your PC and see if that fixes the issue.
However, if the problem persists after, try the following steps.
If the problem persists after you have tried the above steps, please let us know using the contact form, including the model number of your tablet, the version of the driver you have installed, and a description of the problem you are experiencing.
Check your tablet’s driver to ensure it doesn’t need to be updated.
If the problem continues even after ensuring the driver is up to date, open the Brush Environment Settings window from the File menu in MediBang Paint. Then try the following steps to see if the problem is resolved.
Some tablets may work correctly if you check the “Validate native OS pen pressure detection” checkbox in the Pen Pressure Detection with the driver uninstalled.
Unfortunately, MediBang’s support team does not currently accept inquiry forms about issues with non-Wacom tablets. So please understand that if the problem persists after you’ve tried all of the above steps, we cannot offer any further guidance.