Post page Elementor Button Text Colour not Changing

[eclickzone]

my website applies the Buzzstore Pro theme.

I can't change the "All Post" Button text color, but no problem changing the button text color at the " all pages" content.
BUT, I have no problem changing the all pages button text colour, such as landing page, product pages

I disable the Elementor default color also can't help to solve the problems.

Please advise.