Originally Posted by aofarrell2

I've experienced exactly what you are describing on other electronically controlled automatic transmissions (I don't have a fourth gen RAM), at those higher speeds and near WOT (wide open throttle), the transmission will downshift simply because you are at or very near WOT (which the computer sees as you demanding maximum power, causing an immediate downshift), but sensing no significant load (or real demand) will upshift ASAP as being in the lower gear isn't necessary.

I wouldn't call it abnormal, just a little quirk some autos have at faster speeds and WOT, due to the programming/shift tables. Said quirk may become a lot more prominent if downshifting causes you to come near the upper end of your RPM limit, the transmisison will be very eager to upshift to avoid running the engine at high RPMs (or possibly over-revving) for sustained periods of time.

Hope this helps explain the phenomena.