Back Wheel Movement on the Trainer - Normal?

This morning I noticed a bit of a creaking noise when I was standing up on my bike “sprinting” on the trainer. I sat back and noticed that my back tire was wobbling a bit. Should I make the tension holding the tire in the trainer tighter? Is this normal to see this happening?

The trainer is a Cycleops Fluid 2

Thanks

I would say just make sure you don’t have anything really valuable in front of you. Kidding. Although I only have limited experience with the Cycleops Fluid 2, I will say a little movement on the trainers I have used has not been abnormal, but not a lot. Is your wheel pretty true? Holder things (technical term) cranked down pretty tight on the skewer?