Humans are weird - which is why we need to begin to have an understanding of our own - Cognitive biases.
Take a look at this wikipedia page - a List of Cognitive biases.
https://en.wikipedia.org/wiki/List_of_cognitive_biase
Exhausting isn't it !
Lets just zoom in on just a few of the most common ones.
This article is well worth a read.
https://medium.com/@Angy_Stallone/the-most-common-cognitive-biases-9499bbbf97c7