Here is a sample of the test failures, they all look similar. This is what I'd call a rounding error, but maybe it's something else?
<trkpt lat="51.728263833" lon="8.736165997"> - <ele>95.195312</ele> + <ele>95.195313</ele> <time>2013-08-15T15:19:01Z</time> <speed>522.500000</speed> <name>TP8440</name> @@ -50705,7 +50705,7 @@ <name>TP8445</name> </trkpt> <trkpt lat="51.728286721" lon="8.736141201"> - <ele>95.101562</ele> + <ele>95.101563</ele> <time>2013-08-15T15:19:01Z</time> <speed>511.944458</speed> <name>TP8446</name>