How to remove this annoying red-blue-yellow squares icons keep appearing on my TAB+ALT

[Windows 11]

Hello, I did my research and the icon is the default icon for an Application programmed in C# with SharpDevelop for Windows, I tried to look at Task Manager to try to find the same icon, and I can't find it. And It appeared this afternoon, I uninstalled everything I downloaded that day and yesterday to make sure be more safer than nothing, and it STILL appears... I did restart my PC, still there. It's more than at threat to my PPC butit effectively slows down my gaming experience. I can close the applications but it will appear again later in 10-15 seconds, and when tried to open it won't show

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