It sounds like you are running into a known bug in K2 2.4.1 where the aliases are actually disregarded and are created from the title tag no matter what the item alias is set to. It's been fixed in the SVN. Take a look at this thread and see if this solves some of your issues:
It sounds like you are running into a known bug in K2 2.4.1 where the aliases are actually disregarded and are created from the title tag no matter what the item alias is set to. It's been fixed in the SVN. Take a look at this thread and see if this solves some of your issues: