I decided to check my reputation tab on MSE, and saw this:
What is with the +30, +40, +50, +60, +70, +80, +90, +100, +110?
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In the process of updating the layout for the Activity Reputation page, a bug was introduced that replicated the first reputation entry for a given item for each reputation change instead of the appropriate one. I've shipped a fix network-wide.
This is an item index issue that slipped through the cracks. We have a fix in the works. Expect it to be resolved in the next 24 hours. Thanks for the report!