Vibration with my new rollers - is this normal ?

[dogman]

My Arion Digital Smart B+ bike rollers give out a rippling vibration when riding them.

It's NOT my wheels as I don't get this on smooth roads. I've also tested different wheels.

The vibration feels like riding over small corrugations. I'm concerned one of my rollers could be less than perfect e.g. lumpy.

Your advice on this would be great.

Thanks in advance