Hello,
The Storage Displayer has 2 layers of the font. One in the front and the shadow version in the back. On some items the shadow version defaults to the same color as the front font giving it a "double image" look and difficult to read. I have attached an image.

Does this happen in the latest version (1.1.3) ?

Yes. I am currently running 1.1.3. Be aware that these are only some example items as this does not happen with all items.

Issue has been fixed for the next update