Purchase from random account showing up in Mac App Store?
This is caused by a Mac AppStore Receipt residing somewhere on your system that was issued for different account. Spotlight is generally of no use in finding these, since it can't go deep enough to find them within the places they are. Usually the offending receipt can be located with a simple command, that may have to be adjusted according to your file system structure. 

Open Terminal and try:

cd /


then

find . -type f -name "receipt" -exec grep -s -R -n -i "com.ensenasoft" {} \;



Press Control - C to cancel/stop


if located you will should see something such as:

Binary file Applications/Mahjong Deluxe Free.app/Contents/_MASReceipt/receipt matches


If it failed to locate anything you will need to adjust the path, for example to search a different volume:

cd /Volumes/&lt;Name of Volume&gt;


then try the command again.