Let's take a look at what Dr. Larry Bowers said
“In conclusion, I cannot determine with any certainty when, at what dose, or what chlorinated anabolic steroid was ingested that gave rise to the July, 2017 result,” Bowers wrote. “Based on the data provided, I conclude that no DHCMT exposure occurred between August, 2018 and December, 2018. I cannot exclude the possibility that the December 9, 2018 result arose from an exposure before July, 2017.”
Could it be that Jones' ingested Turinabol between January 2018 and June 2018? Keep in mind that he was not tested in the first two quarters of 2018.
https://ufc.usada.org/testing/results/athlete-test-history/
You can verify that right here. Search by quarter, year, and athlete name.