Today I mixed up USDT and USDC, went to check on XLM, set the timeframe to 3 days. And I noticed the moment on December 4th.

Switched to USDT/USDC, then USDT/XLM, and I didn't see anything.

Can someone tell me what this was?

Maybe someone made 20x on December 4th?

20x is 2000% pnl, right?