The first thing I would check are what are the test dates for the two 464 tests? FTDNA did not always report more than 4 values on 464 even when found. I administrate the SHORT DNA Project at: http://www.worldfamilies.net/surnames/short/resultshttp://www.worldfamilies.net/surnames/short/results
If you look at Lineage II, all 13 members have at least 6 values.Only the latest two, tested in July 2011 and in July 2012 were reported initially with 6 values.The other 11, the latest being in May 2010 were initially only reported with 4 values.After requesting that FTDNA do a marker review, they found all 13 members have *at least* 6.Two that have taken the 464x test have 8.
If your one with only 4 values is an older test, I would have FTDNA request a marker review of 464 for it.