Mathematical language just isn't perfectly understood by many people. People could mistakenly use "every month average" when they actually want the 'average per month' but that doesn't change the meaning of those terms, just as people crafting about "stationery autos" does not change the meaning of "stationery" or "stationary". https://financefeeds.com/paytm-shares-drop-after-india-dismisses-reports-of-upi-transaction-fees/