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NRB525 is correct above in referencing your TU credit report here.
OP, your gripe isn't with TU, as TU isn't in control of your score itself. If your TU score is acting like a yo-yo, it means your TU CR data is fluctuating often. Your job really is to determine what exactly is changing... maybe it's the same thing being added/removed, or maybe it's different things if the score changes you are seeing aren't consistent. I would research that a little bit first before being upset with TU. Almost everyone by definition has a score that's lower than their other 2, sometimes a good bit lower, but that doesn't always mean there's an issue related to the bureau with which one possesses their lowest score.