Dates on map not matching dates on spreadsheet

[fannnfannn]

The dates on my spreadsheet and the dates on the actual timemapper are not matching up. On my actual timeline, the dates are a year or more off. For example, the date "10/20/1932" on my spreadsheet appears as "8/10/1933." A date that is "3/30/1935" appears as "6/3/1937."

Does anyone know why my data isn't being read correctly?

FYI here is my spreadsheet and timemap.

Spreadsheet:
http://timemapper.okfnlabs.org/fancyfannie/jorge-mori-timeline#1

Timemap:
https://docs.google.com/spreadsheets/d/1QdQ-gxh_9jtUOlr3LD9md-XJmNI66Hvvdmv1U4MsUKM/edit?usp=sharing