Part that spins unexpectedly very slowly in SolidWorks composer

Hello

I have parts that rotate very,  very smoothly when no rotation information has been ordered. These are parts that are intended to be designed later, but I don't understand why before the rotation sequence is controlled, these parts rotate but very  ,  very slowly, and then stop after 1/4 of a turn.

Have you noticed this type of problem under SWC2018?

Thank you in advance for your remarks.