There is a curiosity about the height of the mountain: due to a measurement or transmission error it was assumed until the 1960s that the Nonnenstein was 325 metres high and thus the highest mountain in the long ridge of the Wiehen Hills. In older lexical works at the beginning of the 20th century, i.e. well within the period when surveying was able to provide accurate values, and the height of other mountains such as the Zugspitze were already determined to the nearest metre, it was even given a height of 336 metres. In fact, however, the Nonnenstein is only 274 metres high, i.e. 51 to 62 metres lower than had previously been assumed, and also visibly lower than the Heidbrink (319.6 m). Nevertheless, the Nonnenstein is still the highest point of the Wiehen Hills in the district of Herford.