Thanks for the feedback @VanitaW !
It seams like you are referring to text height, not card height here:
the width is the same - 184px, but the words that don't fit in a line, will move to next line and that will give the impression of uneven line (hyphenated words will solve that)
the height: we were thinking to show the entire title and then have a specific character limit for the description so we don't go too long with it and that's why it's uneven. Some texts could be 2-3 lines long and then there is less space for description in this case
One of the section grid in the News Feed is a different size. Each grid should have the same height and width.