multiple origin of the history data from metaquotes ? i am looking for infos about the source of this history

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i started the following way:
- deleted the hst file of the EURUSD (so no more history of other sources)
- download of the EURUSD M1 in the history center tab of metatrader 4
while watching the chart 1 found out that the history from jan 1999 to 18.9.2006
seems to be from a different source than the history from 19.9.2006 to 2008
the older history has a bigger distance of the high and low per bar
than the history since 19.9.2006
the older history has a almost constant volume per bar,
while the history since 19.9.2006 has a wider spectrum regarding the volume
i am curious about the source of the older history since it seems to provide better results for
EA backtesting (especially scalping)