I have recently updated my own version of the Oanda API (REST v20) and noticed differences in M1 bars with Zorro download. I compared for instance M1 bars from the 1st of Jan 2018 till the 1st of June and M1 bars are the same only for the recent ones. Moreover, Zorro generated much more bars (4k on around 150k). Could you please explain me the reasons of such differences in term of bar values and number?
Thx