multiple tracks on the waterfall

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Last seen: 6 months 2 weeks ago
Joined: 2008/11/11 - 21:46
multiple tracks on the waterfall
Image icon WSPR tracks.JPG104.38 KB

It happens to me sometime, I have received multiple traces on the waterfall, with a frequency shift of about + / - 32 Hz (or more)
What could it be?
overmodulation? or some propagation anomalies?
I attach a screen shot as an example. (Frequency 7 MHZ)

73 Flavio, IK3XTV