This can be caused by having a high number of student attributes in Education Edge, this can vary from database to database depending on other factors but this has been noticed when the number of attributes in this table increases above two thousand.  When your student attribute table grows to over several thousand it can prevent the correct information from transferring from Education Edge to Blackbaud Netcommunity.  It is recommended to remove old or unneeded attributes periodically to prevent this table from growing to excessive sizes.  A temporary solution to this can be provided by support but unneeded attributes will need to be removed from the Education Edge to reduce the size of this table.