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Top showing 64% idle on first screen or batch run, while there is no idle time at all

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http://serverfault.com – I'm running a quite heavy number crunching thing on a few 4 core servers, all running Ubuntu Precise Pangolin LTS 64 bit, in the cloud (so I suppose in a virtualized environment). To monitor the cpu usage, i wrote a .sh that uses "top -b -n 1" (that is a single run of top, only the first "frame") and merges it with some other data, to write a small report. However, top always reported 64% idle on the cpus line, for each server, even if I was quite sure all four cores were 100% busy. In fact, running top interactively, in the first frame it reports 64% idle time, but as soon as it refresh it (HowTos)