It seem that you have compounded the transform controls. Edit page and color page by default have different scaling options for different image processing (scaling and transform) in the workflow. In fact color page can do all the edit page can in the sizing panel. That is why it is there.
Most of the time, this order of operations is irrelevant to the user who’s only interested in the end result. However, if you’re trying to achieve something very specific, or if you’re wondering why you see a particular result when you use the features of the Cut, Edit, Fusion, and Color pages together all at once, this chart should help make things clear. For full chart go to reference manual (accessible form help menu in resolve) Color | Chapter 142 Image Processing Order of Operations, page 3200

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The Five Color Page Sizing ModesThe Sizing Palette on the Color page can be put into one of five modes, each of which accomplishes a different task.
— Edit Sizing: These controls mirror those found in the Inspector of the Edit page.
— Input Sizing: These controls let you make sizing adjustments to individual clips that affect their overall geometry (pan, tilt, zoom, and rotation). These controls are useful for doing clip-by-clip pan and scan adjustments.
— Output Sizing: These controls are nearly identical, except that they affect every clip in the entire timeline, all at once. Output sizing is useful for making a formatting adjustment to an entire timeline, such as changing an HD timeline to an SD timeline with simple adjustments to crop and pan the resulting framing.
— Node Sizing: Lets you add targeted sizing adjustments at any point within the node tree. Like Input Sizing, Node Sizing is specific to a particular clip. Unlike Input Sizing, Node Sizing is affected by operations that split color channels (such as the splitter/combiner nodes) and limit the image (such as qualifiers and windows). You can also add as many node sizing adjustments to a clip’s grade as you need.
— Reference Sizing: A set of sizing controls that lets you reposition the still when a wipe comparison is being made. Using these controls, you can move the still image to better compare it to the clip you’re wiping it against. The Reference Sizing controls only work when you have a wipe enabled.
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Sizing Order of Processing on the Color PageInput Sizing adjustments are applied before all image processing that takes place in the node graph, including Node Sizing, while Output Sizing adjustments are applied after image processing in the node graph.
Using
Node Sizing, you can apply individual sizing adjustments on a per-node basis. All Node Sizing adjustments within a grade are cumulative, and any keyframing done to Node Sizing parameters is stored in that node’s
Node Format keyframe track in the Keyframe Editor. Two good examples of Node Sizing include realigning color channels individually in conjunction with the Splitter/Combiner nodes, or duplicating windowed regions of an image by moving them around the frame.
Note on
Compound Clips. Compound clips are essentially containers of timelines that conform the timeline to a particular set of limitations. If you have no other choice and you need to conform different clips to a single clip to apply a particular operation than compound clips work well, but I prefer to avoid them as much as possible, because they limit options and most of the time you can do the same with other available options in resolve, and with all the flexibility you would otherwise loose if you use compound clips.
People seem to love using them since they are easy to make and get you fast what you want, at the expense of future edits. I would recommend for example to just use
sizing panel or transform node on the color page or do it in fusion, rather than doing this kind of work in the edit page and than compounding that later in other pages. You will run into problems as you have discovered.