Q: What are those “blobs” on the printed design?
A: They indicate places where the width of some letters has been adjusted in order to align both edges of the text, and so should more accurately be called “stretch marks”.
A sofer is allowed to extend or contract 7 specific letters (as indicated by the turquoise squares on your printout) to justify the margins.
In the first line of the example shown, there was no need to adjust any letters; in the second line several letters have been extended in varying lengths.
Treat each square of a “blob” as a regular cross-stitch.