Storyline 360 Morph tool affecting objects that it shouldn't

You may be experiencing what is demonstrated here. (you can post your example project for more feedback). 

https://360.articulate.com/review/content/52c2793a-16c7-4f3c-a1f9-4db420c61d3b/review

Notice the two stationary objects. The one in the top right flickers between slides, while the one in the bottom right remains steady. The difference is the Morph ID. The top right objects have different Morph IDs. As a result, they fade out partially between slides. The bottom right objects have identical Morph IDs, so they remain fully visible between slides. The Morph ID can be seen in the context menu of the slide object (when right clicking on the bounding box).

The Morph ID is in the parentheses, in the top line. If you duplicate a slide, all of the objects will be recreated with duplicate Morph IDs. If you copy a new object and duplicate or paste it onto another slide (e.g., CTRL-SHIFT-D or CTRL-V), it will also (usually) get a duplicate Morph ID. If you create a new identical object on the other slide, it will have a different Morph ID. Also, if you copy or duplicate an object on the same slide it will normally get a new unique Morph ID, so don't copy it on the same slide before moving it to the new slide unless you want a new Morph ID.

Morph IDs link objects between slides. There should be only one object on a given slide with the same Morph ID. Multiples will break the morph transition. If things do not behave as you expect, check the IDs. You can't edit the Morph ID, so if they become unlinked or corrupt,  you have to manually delete and copy/duplicate objects, repositioning them where they should go, to get a new linked pair.

The example project is attached. Perhaps this will help with your problem.