Morph causing objects to fade even with same Morph IDs

As Andrew mentioned, we're not sure of your intent. Were you looking for this effect?

https://360.articulate.com/review/content/a64ce099-ac7b-4abe-8394-c2e9c302a870/review

If so, you can't reliably do it with by morphing textboxes because:

1. The morph effect is simple and only accommodates basic object changes
2. While I believe you can shift identical text boxes, You can't do much in addition to the shift
3. I've found text box morphs to be quite unreliable. Sometimes they work, sometimes they don't, all on the same exact slide set

To make this work, you need to layer five sets of 'text' objects that are duplicated across the adjacent slides. The main 'text' object on the display slide is normal, while those on the adjacent slides overlap that slide's main 'text' object, and they are made fully transparent. To make it work reliably, you need to make images of the text blocks (i.e., transparent PNGs) to use as the 'text' objects. Replace the text with the images, position between slides, set the transparency, and you should be good.

To copy across slides with the correct morph IDs, just copy the main object from a slide, and then go to each adjacent slide and duplicate it with CTRL-SHIFT-D. 

I had an earlier example of this concept using images as a numeric counter instead of text boxes for the same reason. 

Morph Animation Not Working with Background Image | E-Learning Heroes

Your modified project file is attached.