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Try moving both devices to the right hand ports:
https://www.imore.com/heres-why-you-should-probably-charge-your-macbook-using-ports-its-right-side
grams
cjr
Im having a issue with my 2018 Macbook pro 15". I charge it and use it on a henge dock most of the time but when I have my Sandisk SSD or another hard drive plugged into the computer via one of the ports on the side of the laptop it doesn't seem to use the power it seems to use the battery power and runs it down and the when i unplug them it charges it again.
Has anyone else had this issue?