You have set 300 in "Swap waveforms". This means that every 5 minutes the waveforms are swapped. This is useful when making colloidal silver, and in contact mode as well, to prevent burns. When the waveforms are swapped, the numbers appear in red.
For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=5&t=4836
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