Some field will be "stretch" on PDF print

Using ReportBuilder 10.09
wPDF 3.1.4
only sometimes (I do not know when), and only by some of my customer, the generated PDF contain some "Stetch" field like this:

http://img147.imageshack.us/img147/5121/displaykyj.jpg
what can be?
thankyou

sorry, but can anybody help me?

Why do WPRichtTexts sometime print thext bigger and larger than usual? Please check the picture in the previus post so you can better understand what's the matter is.

Can it be a resolution's problem?
A version's problem?
Something else?

no,
the "PRINTER_AS_REFERENCE " is yet disabled. The problem must be something else.

any other ideas?