Note that the Robert & Aves Family have an Eliza AND an Elizabeth  ... in the 1841 census
Its Eliza  with the 1836 Dob ..
ELIZA MARLOW  
   Christening:  01 MAY 1836    Offley
 
Her Parents are: 
  Father:  ROBERT MARLOW  and  Mother:  AVIS  
The 2 actual Elizabeths in Marlow IGI are SUBMITTED - not ORIGINAL  records, so somebody else has made a similar mistake ...
all things considered, I'd go with the Census ...