If 90% is traded by algos, why is there so much volatility?

Shouldn't most algos have pretty similar coding and parameters? I mean, they're robots.

I would think the stock market graphs would look more stagnant than erratic.

Stocks dump or pump 10% in a day, an entire index pumps or dumps of 6% in a single day.

Looks very human to me. Algos don't have FUD and FOMO…or am I wrong?

What causes that volatility and huge changes in a span of just 10 hours without absolutely no news.

Same rate hikes, same FED, same war, same CPI, same inflation, same unemployment.

Stocks go up and down 10% in a single day on zero news.