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Any ideas why that could be ?
If your links were recently acquired, it may take a few weeks or longer before they show up. You may have to negative out any sites on which you have ROS links, in order to get more sites to show up.
My observation is that in some cases Yahoo does show a lot less backlinks than actually exists. You need to use alternatives to see if there is such discrepancy.
Las VegasOctober 6-8, 2015