App icon even after closing

Hi all, This is not a question. This is a glitch in applce ios 13.5.1. My iphone xs is up to date in software.

When i m multitasking with multiple application, it's ok find the icon of the previous application on the top left corner of my current application. But even after closing the previous application the current application shows the icon of the closed application. Which is surely a glitch. I suggest an update for this to the apple developers.