All OPEC data is from the latest OPEC Monthly Oil Market Report and is in thousand barrels per day. All data is through July 2018.
OPEC crude oil production was up 41,000 barrels per day in July but that was after June production was revised down by 43,000 bpd. So OPEC production is actually down 2,000 bpd from what was reported last month.
The big difference here is in what secondary sources says Saudi Arabia produced in July, down 52,800 bpd, and what Saudi says they produced, down 200,5000 bpd. What Venezuela says they produced has no basis in reality.