Why won't text messages delete on my iPad when I delete them on my iPhone or Mac?

Why won't text messages delete on my iPad when I delete them on my iPhone? I have a Mac, iPad, and iPhone. Sending texts works seamlessly between all devices. The problem is when deleting messages on my Mac or iPhone, neither will delete on my iPad, or when deleting messages on my iPad, they still are visible on my Mac and iPhone. To be clear, when I delete on my Mac, it will delete on my iPhone and vice versa, just not the iPad.