Shoes, you might need to retrace steps for your sources of info for places of birth

From their marriage in 1869 and subsequent censuses, these are the place name they gave for their births:
John Yates:
1871 - 29 and born in Scotland
1881 - 39 and born in Scotland
1891 - 49 and born in Glasgow
Mary Miller:
1871 - 29 and born in Manchester
1881 - 39 and born in Manchester
1891 - 49 and born in Manchester
As you can see, they are pretty consistent with their info for the censuses.
Monica