While trying to edit/update a hosted feature layer I got a warning:

After checking the properties I found multiple Spatial refecences:

I didn't know this was possible. Looking at the fields I see a small mess:

4 shape length fields, hmm. Some of the data is collected using Collector, other might have been copied using Pro.
Does anyone know on how to clean this, resolve the multiple Spatial Refecences?
Thanks in advance for your time.
Regards, Bert