I’ve not been able to recreate the issue, that you describe, with an iPad Pro running iPadOS 16.3.
The most logical explanation for your observed behaviour is poor geometry. For an accurate position fix, good DOP statistics require a clear view of the sky - with at least four visible GPS (or other GNSS constellation) satellites with good geometry relative to your location. Some locations, typically at high latitudes, will frequently experience poor DOP.
You may also be experiencing interference to the GNSS satellite signals. Many counties are conducting jamming trials that are intended to either significantly degrade, or completely deny access to, accurate GNSS satellite positioning.