Click discrepancies between analytic platforms are normal and expected. Our attribution model is last click, 30 days. This is also the standard for Google Analytics. The reason for discrepancies is likely due to your vendor (in this case SourceKnowledge) losing last click attribution in your Google Analytics.
The platform tracks all sales from customers that we brought to your website, however, if the last click before they purchased is on a different platform, your analytics system will attribute that click to another vendor, thus the conversion to that platform. If you refer to your assisted conversions in your GA this should be more reflective of our Dashboard.