Hello Laura2437,
You may try checking the list of devices that the Apple ID is signed in on to see if perhaps the iPad in question may be a different or older one. The list can be found on the iPhone at Settings > [your name], and then scroll down here. Then, check to see if there are any devices, particularly iPad devices, that are no longer owned or in use.
If it's only showing the one expected iPad device then this page can help provide some details that may improve the GPS/location services accuracy: About privacy and Location Services in iOS, iPadOS, and watchOS - Apple Support
Improve GPS accuracy
GPS accuracy depends on the number of visible GPS satellites. Locating all visible satellites can take several minutes, with accuracy gradually increasing over time. To improve GPS accuracy:
* Make sure that you've set the date, time, and time zone correctly on the device in Settings > General > Date & Time. If possible, use Set Automatically.
* Keep a clear view in several directions. Walls, vehicle roofs, tall buildings, mountains, and other obstructions can block line of sight to GPS satellites. When this happens, your device uses Wi-Fi or cellular networks to determine your position until the GPS satellites are visible again.
Crowd-sourced Wi-Fi and cellular Location Services
If Location Services is on, your device will periodically send the geo-tagged locations of nearby Wi-Fi hotspots and cell towers to Apple to augment Apple's crowd-sourced database of Wi-Fi hotspot and cell tower locations. While you're in transit (for example, walking or driving) and Location Services is on, a GPS-enabled iOS device will also periodically send GPS locations, travel speed and direction, and barometric pressure information to Apple to be used for building up Apple's crowd-sourced road-traffic, roadway, pedestrian walkway, and atmospheric correction databases. The crowd-sourced location data gathered by Apple doesn't personally identify you.
Cheers.
