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As per 2010, jqGrid (the framework VGPS is using) was not supporting sorting by secondary column, therefore the sort was not guaranteed in any way in case of duplicates.
This multiSort feature was introduced in version 4.5.0 (2013), which is already used in PGC, but it was disabled by ganja1447 because it was not fulfilling his expectations. See the comment on the line 142 of the virtualgps.js:
// multiSort: true, // Not very user friendly to reset the sort.