Thank you for the update.
We could not suspect the exact use case at your end since, we are unclear of the exact machine display settings. So, please confirm us that the issue is reproduced with the sample in our previous update. If yes, the issue might be occurred due to machine configuration at your end and provide the VS version, OS version with resolution and syncfusion product version. If not, the issue might be occurred due to GridControl properties and we request you to share the code example that reproduce the issue. That will be helpful for us to assist you further to provide a proper solution.