Canning Potato Soup
I canned several mason jars with homemade potato soup. After two-three days the liquid seeped out of the jar, and left the solid. I made other soups at the same time, but did not have this happen to those jars. Is this an issue just with starches?
Not knowing what your ingredients are, I will assume your potato soup has dairy products in it. If so you should know that the USDA does not recommend canning with any milk products.
It could also have to do with your processing. If you only did a boiling water bath that will cause problems, or if you did not process long enough.
I hope this helps. Without knowing just what you did it is very hard for me to say.