I just saw the same thing using SH5E. I pressed control, moved my mouse over the green speed ribbon till the tooltip said 10 then let go. It said "speed set to 10kts" and I ended up going 12kts.
I have 1 box awarded to my Motor Officer for the "extra speed" thing, might that be causing this? Like how the torpedo special passive abilities aren't counted in the TDC, perhaps the motor officers aren't counted into the speed setting? They just add on?
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