Merits earned question

So two weeks ago I earned around 3000 merits, making my total merits for the week 10,000ish

The following week (last week), I had decayed to 5100 merits.

Last week I made 5900 merits.

This week, I've decayed to 4515 merits.

Can anyone help me understand in some layman's terms what I'm seeing here? Is this working as intended? A change in merit decay? a bug? My playstyle has me able to play more some weeks than others; so if I earn 5500 merits this week; what kind of decay do you think I should expect next week?

Thanks in advance for your input.
 
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