I created a new collection and synchronised it to Lightroom Mobile. I made some changes to the Collect on my MacBook with respect to exposure and as far as I can tell those changes reflected on the Mobile collect. I then used the iPad to crop the images. I then noticed a warning on one of my images claiming that changes had been made in two locations and I cant remember the options that I was presented. I didn't take much notice as I though it would apply to only that one photo. Next thing I see is all the cropping that I did on the iPad undo itself along with the exposure changes that I made on the MacBook.
What is the correct procedure for making one lot of changes on the MacBook and then another lot of changes to the same images on the iPad?