Mamaroo vibration?

I bought my mamaroo brand new and notice it vibrates on the settings even on low. Is that happening to anyone else? And is that an issue? I don’t have any other swing so I don’t really want to wait to return etc if it’s usable. Any input would be great. Thank you (ps. He just fell asleep and I’m sitting beside him. He is strapped in and I tucked the blanket around him. For those who would comment)
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