Noise pedalling up in the sadlle

Hello,

I just got a new Neo bike and everything seems OK except when I'm pedalling up in the saddle.   Especially at lower cadences (and low power) there are knocking sounds coming from the pedals. 

This doesn't happen at all when I'm pedalling sitting down.  See those videos:

https://bit.ly/3nyWYFj

https://bit.ly/3CgwRHd

Does this happen to you or is there something worng with my bike?

Looking forward to hearing from you.

Best regards

Oscar