2015 Mustang GT paddle shifters?

Hey I own a 2015 Mustang GT automatic since its sports + mode actually shifts better than a manual driver would, but I realized that when on Drive and I activate the paddle shifters they dont stay on manual mode very long like 5 seconds only, what could be the cause? Is paddle shifting only possible on Sports mode or sports + and track mode? Its an insanely fast car on the Sports + and sports, is that why its duration is not long enough?

Thank you

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