Opened quantitative delivery😖

So many coins are from the same dog farm or are they robots?

I am a newbie, and I discovered an issue last night. Please help me figure it out.

Last night, I looked at the contract's bearish list.
Basically, from top to bottom, many coins have the same trend.
One rises, another also rises; one falls, another also falls.
When one hits its lowest point, the others do too.
Why do so many coins have similar trends? Are they all robots?