Hi Milly,
By looking to the left hand box on the original certificate, there should be some writing like Reg. Corr. Entry or similar, next to that entry, this is quite prevalent in case of an accident or similar when mors that one death is registered. I have had 2 brothers drown on a fishing boat where there were RCE's in both.
Of course, do not pay to see original again, it maybe in your viewed images.
Hope this helps,
Tom