Why have my old dear compatible users disappeared?

Hello. The compatibility feature, in the last few weeks, has been answering "sorry but none has book similar to yours, be patient things will go better".
Today I have found some results, but they are veeery low, and my old dear compatible users seem to have disappeared.
what's happening?
Faligio - http://www.anobii.com/019bfb4546189e3...
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