I just tried again on the test platform and it inserts, first , last and full name correctly to the DB.
Can you enable the module debug and check in the showing INSERT queries if you have these:
first, last and name
INSERT INTO #__social_fields_data (field_id , uid , type ,datakey, data , params , raw) VALUES ('2','6464','user','first','Searlas','','Searlas')
INSERT INTO #__social_fields_data (field_id , uid , type ,datakey, data , params , raw) VALUES ('2','6464','user','last','Bellefeuille','','Bellefeuille')
INSERT INTO #__social_fields_data (field_id , uid , type ,datakey, data , params , raw) VALUES ('2','6464','user','name','Searlas Bellefeuille','','Searlas Bellefeuille')
from the 6th query ?
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