Search doesn't work in some scenarios (possibly font-size related)

We are trying to use the PDFExpress search, but have noticed some text isn’t found. On closer inspection, if we copy/paste out of the PDFExpress viewer, we can see that some text incorrectly has a carridge return between some of the text. This appears to coincide with text-size changes in the text. If we search in the native webbrowser PDF viewer, it works perfectly. You can see this from the following image…