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 ...