Uncategorized even when it has a category name?

Hi,

I keep getting “uncategorized” in my permalinks even though I click the primary category, which is “strength training” or even any of my other categories.

Heres what it looks like https://synergy-athletics.com/uncategorized/methods-of-strength-training-max-effort-method/

How can I get that “uncategorized” to write a category in there? Thanks!

Joe