Looking at FMP's guide to searching the 1939 Register, I can see that we shouldn't be surprised the results are all messed up.
http://www.findmypast.co.uk/1939regi...etting-started
They have an image of the "Churchill Household" record for a
Winston Churchill born 1900, 2 more people, and 3 closed record people, living in Rhondda, Glamorgan. Below this image it says the following:
With this information, you can confirm that you've found the correct record or household. The image above shows the preview for Lily Phillips. We can see that she was born in 1898, is resident in Bolton, Lancashire and lives with three other people, one of whom has a closed record (either because they were born after 1915 and are still alive, or born after 1915 and their death hasn't been recorded in the register. With this free information, we hope to help you to be more confident that the correct record has been found.