Definitely dont worry. I am very new to carpet cleaning (only started a couple of months ago) and had exactly the same happen to me a couple of weeks ago. In fact I was using multipro, extraction plus and a steempro so exactly the same setup as you.
Before I even left the house the carpet was looking like the waves of an ocean. I was about to get a carpet fitter to come and re fit it but searched this forum and found that they all go back to normal. Sure enough I poped over a couple of days later and it was as flat as a pancake.
Got to admit though, I did C**p myself when I first saw it. Dont panic!
