Sorry have to laugh at some of the suggestions they gave you. Here are some good things to check.
1. Go to settings/Image Processing and change the Remove Tool to "More Stable" (relaunch PS).
2. Try editing in 8 bit RGB not 16 bit.
Here is an example using the same version PS with the Gen Expand, Fill and Remove tool on the clothing wrinkles. Note there are no color shifts, edges.
If none of these help improve, go to System Help Menu/System Info and copy/paste the results in a reply.
I even blew out the exposure to see if something was there after expanding:
I am seeing a defined seam but its in the corner of the image - not sure if that was from a previous expand?
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