It is odd!
Another of the forms on the CWGC (Headstone Text) there looks like a gap between the 'M' and the 'E' in BROOME, although it also gives the initial 'E' beforehand.
They seem to have settled on Broome for all Memorials, but perhaps he was a Brown with a close relative (brother?) named Andrew?
If this is Florence, she was either named as his beneficiary before she married - possibly intended wife, or she was the only known surviving relative through the Brown she married (but for that to be the case, he would have died fairly soon after marriage and she was still using the name Campanelle - questionable, but there was money involved, albeit a small amount).
It throws up many different directions of search!