Receiving notifications from old Topics

Recently, I have being receiving notifications from topics that are from December of 2017, August 2018, and so on. Basically, I have been receiving topic notification from a year(s) ago. I really have no clue what could be causing this.

I have ‘Watching First Post’ enabled for some categories. It only sends me the notification from those categories, but they are from years ago. Could someone help me with this issue?

Buildthomas explained this on another topic:

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Thanks for showing me that, really was starting to worry.

Staff were just re-categorizing some Art Design Support threads under Game Design Support and some other categories. About 150-200 threads were moved. Already done so inconvenience should be over now.