There always seems to be a focus on whether issues are caused by low self esteem, but some adults and kids have inappropriately high self esteem. Inappropriately high self esteem causes issues such as -
"Research from psychologist Roy Baumeister shows criminals have higher self-esteem than the general population. Baumeister and colleagues explain, “When large groups of people differ in self-esteem, the group with higher self-esteem is generally the more violent one.” "
"Researchers have found that self-esteem is positively associated with narcissism. People who rely on others' view of them become angry when their self-image is insulted or threatened. This idea is related to narcissistic injury. When people discover other people do not view them as they wish to be viewed, it can result in aggression."
And can also lead to a fear of failure.
www.psychologytoday.com/gb/blog/after-service/201703/is-your-self-esteem-too-high-be-successful