MISRA C 2012 rule 8.6

[mcorles5]

The rule definition is "An identifier with external linkage shall have exactly one external definition." When I look at where it says there are multiple definitions, it points to the same line.
Ie.
global variable 'CALIBRATION_MISMATCH' has multiple tentatives of definitions (C:\User\Desktop\globals.c:137, C:\Users\Desktop\globals.c:137) (Required)
U8 CALIBRATION_MISMATCH;