Could it be that the devs who write that code are not allowed to touch the CSS so they implement the visual functionality they want in their framework instead of telling the design team their intent?
There could be any number of weird constraints that would lead a developer who knows better to do such a thing in a specific situation, but someone designed (or failed to intentionally design) the system in question.
That person should sit alone in a room with no distractions and think about what they did.
That person should sit alone in a room with no distractions and think about what they did.