After a phone has been through several rounds of driver installs, uninstalls, and different USB ports, Device Manager quietly builds up a graveyard of old device entries for the same physical phone. Most of the time this is harmless, but it becomes a real problem when a stale entry's leftover driver binding interferes with the current one, producing detection failures that look nothing like a normal driver issue and don't respond to reinstalling the driver you can actually see.
Windows creates a distinct device instance for every unique combination of hardware ID and USB port path the device has ever been plugged into. A phone plugged into three different ports over its lifetime, each time under a different driver state (default driver, then a vendor driver, then a different vendor driver after a reinstall), can easily accumulate half a dozen device instances, only one of which reflects how the phone is currently configured. The ones no longer physically present just don't show up in the default Device Manager view — they're not gone, only hidden.
In most cases stale entries just sit there unused and cause no harm. They start to matter when a driver update or uninstall targets the wrong instance — for example, uninstalling "the driver" through a vendor's uninstaller only removes the currently connected instance, leaving an older ghost entry's driver association intact and ready to reapply the old driver the next time the phone happens to enumerate on a matching port path. This is a common, confusing cause of a driver update appearing to have no effect: the update did work, just not on the instance that's actually active right now.
Comparing the Hardware ID of the entry that's currently bold (active) against any greyed-out ones with a similar name confirms whether they're really the same physical device under different driver states, or coincidentally similar-looking entries for a different Android device that was once connected to the same PC.
Sticking to one USB port consistently for a given phone, rather than rotating between several, keeps the number of distinct device instances from growing every time troubleshooting happens. It won't prevent ghost entries entirely — every driver reinstall on the same port still creates a new instance — but it does keep the list small enough that finding the live one is quick rather than a guessing game through a dozen near-identical greyed-out rows. This buildup is also the reason a driver appears to change back on its own after a Windows Update overwrites it: the update can reactivate an older ghost entry's association rather than genuinely reinstalling a stock driver from scratch.
Households or workshops where several different Android phones connect to the same Windows machine build up ghost entries faster than a single-phone setup, since each phone contributes its own set of instances across whichever ports it happened to use. This is where the greyed-out list gets genuinely confusing, because entries for a phone that was sold or replaced months ago sit alongside a currently-used phone's history with near-identical friendly names. Renaming a device's driver-visible label isn't possible through Device Manager directly, so cross-referencing the Hardware ID's product string, or simply clearing out every hidden entry at once and letting the currently-connected phones re-enumerate fresh, is usually faster than trying to identify old entries individually.
For clearing out a large number of stale driver packages at once rather than working through Device Manager's UI entry by entry, the built-in pnputil /enum-devices /disconnected command (run from an elevated Command Prompt) lists disconnected device instances, and pnputil /remove-device with the matching instance ID removes a specific one. This is more tedious to use than the GUI for a single phone, but scales better when the goal is a genuinely clean slate across a machine that's seen a lot of different Android hardware over time.