1. It is a rare problem but does happen with some models especially if they were originally doodads.
2. Remember what I said in post #191 about SOp (Explicit Rotation) SOps where the Up vector is not specified flopping? The default SOp90 actor is a perfect example.
3. Firstly use the cutscenes editor to see if the attachment points move when the unit burrows, secondly is the Unit actor being created and destroyed by the morph (eg. Viking) and thirdly try the SOp (Rotator) method.
By "While it stands still, the model also doesn't follow it either" do you mean that when the unit unburrows the models become detached from the host? To fix that will require Reference Set event actions to re-establish the host subject.
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Stuff like this is scary. Seems like this person had many dreams and passions that were shattered due to false promises and lack of simply basic real life resources. Although that being said. Working for Blizzard might not be as pleasant as it seems. They are likely to be very demanding of their workers. For me it would likely feel just like what it is: A job.