Im working on test site on my local server. just for the testing reason , i installed UPS module ( zen cart stock ) .......

and i got the following error :
1062 Duplicate entry 'MODULE_SHIPPING_UPS_STATUS' for key 2

with information about all entries that module was trying to add to configuration table.

clicking on back button and clicking on refresh button of browser seems to fix the problem
after that i can edit this module and set it up ..

looking in configure table , i don't see duplicate entry nor i see any entry for this module.

Im just curios as to why this error .. and also i like to know How This module actually works without logging to UPS ?????