We get notification for reputation changes like the below

The problem is, it shows +1? When I open the link, it shows me +10

Assuming this was to save space or indicate how many updates/changes had occurred I downvoted some one and it updated to +9

This is now confusing... if it was +1 to represent 10 points (or 1 change/update/notifications), then +9 should mean 90 (or 9 changes)?

(Please note, I've removed the down vote :) )

Is this expecting behaviour? It has been going on for a few thinks I think.