Symptoms
Assume that you have a merge replication environment together with a custom stored procedure conflict resolver in Microsoft SQL Server 2008, SQL Server 2008 R2, SQL Server 2012, or SQL Server 2014. In this situation, you may experience Merge Agent failure or incorrect results such as additional characters in character type columns or additional numbers in numeric type columns.
Resolution
The issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 1 for SQL Server 2014 /en-us/help/2931693
Cumulative Update 9 for SQL Server 2012 SP1 /en-us/help/2931078
Cumulative Update 11 for SQL Server 2008 R2 SP2 /en-us/help/2926028
Cumulative Update 15 for SQL Server 2008 SP3 /en-us/help/2923520
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.