RONBEIBaby Bassinet, Bedside Sleeper Cribs,Baby Bed to Bed, Adjustable, Portable for Newborn, Infant/Baby Boy/Baby Girl

I love this sleeper but it tilts on the side that comes down. I’m concerned about safety- is this normal or did I not set it up properly?

Is there an extra mattress cover? What sheets can go with this?

Can it be swung manually ?

Does this fit the dockatot?