Why two Transforms in a row do not stack

A Transform sets position, rotation and scale rather than adding to them. Wire one straight into another and the second replaces the first instead of combining with it.

The usual casualty is hinging. The old way to hinge a door, lid, shutter or arm was to offset the part so its hinge edge sits at the origin, then rotate and place it. Chain those two Transforms and the offset is discarded, so the part spins about its own middle.

For hinging, use a Socket on the hinge edge and Attach the part to it, then one Transform to swing it. That gives a correct hinge with a single Transform and no stacking to get wrong.

Where you genuinely need two, put a Join Geometry between them. Join leaves its input untouched, which seals the inner Transform so the outer one cannot overwrite it. A Join with one input is a real, load bearing node here even though it looks like it does nothing.

The graph doctor warns when it sees two uniform Transforms in a row.

When a part is placed by more than one Transform, check its bounding box rather than trusting the render. A part rotating about the wrong point can look right from one angle.