Perhaps not so strange, could be similar circumstances to my own birthplace. I was born in 1940 at my aunt's home in Cambridge. My father, mother and grandmother lived in Boston Lincs, mum and grandma having moved there on the marriage in 1939. Grandmother too enfeebled to help at birth etc. Dad unavailable due to war conditions on the railway, so Mum had me at her sister's house. This will have left no trace anywhere other than on my birth certificate.