Why do some maps in China ancient history books say that the Yellow River Estuary is under Shandong Peninsula and some are in Bohai Bay?

At present, the Yellow River Estuary is at the intersection of Bohai Sea and Laizhou Bay, probably in the north of Shandong Peninsula. It was formed by the diversion of the Yellow River in 1855.

Historically, the Yellow River has changed its course many times. During the Warring States Period, it flowed into the sea in the northeast of Tianjin (in the Bohai Bay). Later, there were some small-scale diversions, and the estuary moved south, but it also entered the waters near Tianjin. During the Ming and Qing Dynasties, in order to unblock the Beijing-Hangzhou Grand Canal, the government artificially dredged and built water conservancy projects, and did not hesitate to violate the nature of the river, forcing the Yellow River to flow into the Huaihe River. During the Xianfeng period, the Yellow River burst at the Tongwa Room in Yanglan (near Lankao, Henan), crossed the canal in Zhangqiu Town, Shouzhang County, Shandong Province, and carried the Daqing River into the sea. Since then, the 660-year history of the lower Yellow River from the Huaihe River to the sea has ended, and it has returned to the situation of entering the sea from the Bohai Sea.

So there is an explanation in Shandong Peninsula.