'my CSS classes collide with each other despite of having different name but similarities

for example .create-post-heading class collides with class create-post-heading heading though there are two classes create-post-heading and heading but I don't know which one collides with which one like

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in the above image when I add CSS to the .create-post-heading class my div having those two classes also inherit those properties but how?

csscss-selectors


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