Rendering Issue on Data table - Column Header

[Navneet-10]

Data table column header issue
When data table is rendered, and has a few columns after sortable columns we see that the color/font of the column headers which come after the sortable columns are different than that of the other column headers in the same data table.

I've tried inspecting the same and found that exactly same style class has been assigned to all the column headers and styles are not being overridden.

Does anyone has any Idea what might be the issue here?