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My guess based on the timestamps is that this was the sequence of events :
1)Miin U submitted an edit at 6:28:50 PM
2)You submitted one at 6:31:45 PM
3)Miin U then hit back on their browser to return to the edit page instead of hitting the edit button again, resulting in a window that didn't get the changes you had made added to it.
Edited by Zyffyr

Under the circumstances, I'm assuming good faith here, but in their latest edit to the character page for Highschool of the Dead Miin U undid my latest edit to the same without explanation.