Because it's a mistranslation from the ancient languages. Many scholars have long understood that the term is a misinterpretation in the mistranslations.

An excellent breakdown of how that went can be read here by Eric Sentell. https://medium.com/backyard-theology/a-mistranslation-changed-christianitys-view-of-god-40a7ff358415

Theologian and scholar Thomas Jay Oord discusses it several blogs and is readying a book on this massive mistranslation and misinterpretation. Here's one of this latest blogs on it: https://thomasjayoord.com/index.php/blog/archives/the-mistranslation-of-pantokrater-as-omnipotent