It's probably because you're playing with bots. Botting in Frontlines has spiked immensely in the past few months. They're so easy to spot if you know what to look for. Get used to seeing them and seeing them often. Apparently there was a new program just released specifically for Shatter and a simple Google search will provide you an eye-opening account of how intricate this new program actually is.

You can try to report these players, as they are often seen with the AFK icon displayed, running listlessly between party members and always mounting/dismounting at awkward time. Nothing usually comes of it as I still see these players often enough doing exactly the same thing.