Consider:

[![Enter image description here](https://i.stack.imgur.com/I6j9z.jpg)](https://i.stack.imgur.com/I6j9z.jpg)

I've been studying the vowel chart recently and I don't understand why ʌ is an open-mid back unrounded vowel. Shouldn’t it be a short low central unrounded vowel like in the chart picture I added? Btw, the chart is from my textbook.