A new bug in Windows 10 1903 is causing USB drives to use the wrong icon in File Explorer even though the drives are clearly being detected properly as both a storage device and a portable device. The issue was first reported by G..nter Born of BornCity.com after a reader posted a comment to his blog. It is not known when this issue started happening, but most users have started reporting this over the past 4-5 days. It turns out that this issue is happening when the feature to download metadata and custom icons for installed devices is enabled in the “Device installation settings”””
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-bug-causes-usb-drives-to-show-the-wrong-icon/