Photo edits reset to raw in Lightroom

Hey.

so I edit photos in a Lightroom/apple ecosystem. I use iPhone,iPad and Mac to edit photos depending on where I am. Now the issue is that a lot of the time I would make edits in batches of anywhere between 5-50 photos on the iPad. Then later that day I would look on the Mac or phone and find it has reset all my edits but has saved the versions so all I have to do is reset to the latest version. 

why does it reset the edits to raw? I'm trying to edit thousands of photos and I don't always catch the reset. 

please help as this is most annoying 

thanks

chris