Equations not rendering in markdown book

In this [https://bayesiancomputationbook.com/markdown/chp_02.html website], written in markdown if I'm getting this right, the equations are not displaying in my browser. My browser is displaying corretly all the examples in the other questions on math rendering, and also in similar books ([https://bookdown.org/content/3686/bayes-rule.html#bayes-rule-1 here], [https://moderndive.com/5-regression.html here]). I've deleted cookies and cache, disabled extentions/adblocker, tried safe mode, without any change. I have the same problem with all Edge and Chrome too and even on another computer. I thought the problem was in the website but the equations are rendering fine when I test them on https://www.browserling.com/. Thanks in advance for any help :D