When a payment is made by a constituent that has a matching gift relationship with an organization, a matching gift claim is also generated. The matching gift claim credits the matching gift organization, and the individual donor. However, when a payment is has split applications - one to a donation, and one to a pledge - the recognition credits on the matching gift are incorrect. The matching gift organization is credited for the full amount once (which is correct), but the individual donor receives two recognition credits for the full amount of the transaction.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.