Why does my window or application minimize when its child process exists?

I am experiencing a strange issue with Ubuntu 18.04 that I don't know could have been caused by a wrong configuration or a conflict from recent application installs. What happened was whenever the child process of a GUI application exists, the parent GUI minimizes. Example cases would be:

Example 1:

Open Naulius, find a tar file and open it by double clicking. Select /tmp then click Extract. Immediately, the File Roller app that just extracted the files minimizes.

Example 2:

Open Nautilus, right click on a folder, click Open in New Window. Once the new window opens, close it. Immediately, the parent window also minimizes

Example 3:

Open Terminal, type file-roller. Once the File Roller opens, close it. The Terminal window also minimizes. This also happens with gnome-calculator. But this issue does NOT happen with firefox or gedit.