Thread:Semantic-mediawiki.org:Community portal/Strange Properties appearing

I've had a persistent problem with a Property I use: "CentralIndexRef" this is usually a reference number eg V51 or X1, it seems fairly straightforward. I use a form to build the data.

Article |CentralIndexRef=G T X W

However I get loads of junk entries appearing

CentralIndeB1Ref (134 uses) CentralIndeC2Ref (88 uses) CentralIndeP4Ref (56 uses) CentralIndeR2Ref (54 uses) CentralIndeA3Ref (52 uses) CentralIndeK5Ref (40 uses) CentralIndeN3Ref (39 uses) CentralIndeS3Ref (34 uses) CentralIndeN1Ref (24 uses) CentralIndeK4Ref (24 uses) CentralIndeDRef (22 uses) CentralIndeG T X WRef (21 uses)

Etc, etc. It seems as though it's treating the x in the property title as a variable. I've just wiped and rebuilt all the data as suggested here: Help:Repairing_SMW%27s_data, but it doesn't seem to have solved it.

is this a known issue?