I got a notification today, Facebook says 2 likes in that notification but when I log in I only see one. How can it be possible?

When I log in to my Facebook account, I see only one like from my ex, but before that I was able to see 2 likes on the notification. How can it be possible? If you know the reason, please inform me...

I got a notification today, Facebook says 2 likes in that notification but when I log in I only see one. How can it be possible?
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