If you go to the BitBake variables tab in the Configuration page, open the 'Set in file' filter dialog and select the 'bitbake.conf variables' option, when the filter results come in you will see that for some variables (for example, AR and AS) the same file name shows twice, because more than one operation is performed on the variable by the same file. If at all possible, we should show the file only once.
commit 5a293287af999941b6add946362ea88a5c665037
verified in master:863cc7483f5ee43189537940de8ee5c0964d24cc