If the input file has output asked for multiple generators which are located at the same bus then output of only generator is printed out. For example, if the input deck has following:
<generator>
<busID>31</busID>
<generatorID> C </generatorID>
</generator>
<generator>
<busID>31</busID>
<generatorID> G </generatorID>
</generator>
Then only generator with ID C has its values saved to the output.