According to ChainCatche, mempool founder @mononautical posted on the X platform that all confirmed and pending wallet collection operations of OKX starting from block 846867 generated a total of 2,385 transactions, costing 357,092 inputs, consuming 103 MvB, with an average fee rate of 246.65 sat/vb and a total fee of 254.28 BTC (about 17.6 million US dollars). He explained that this seemed to be due to a poorly executed automated system that caused the fees to get out of control.