Post Earning decreasing automatically?

mocool1(47)
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#help
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I am noticing for a long time that the post earning once I have posted decreases automatically with the passage of time.Like one of my post showed that the potential earning is $12 but after 2 days it was less than $10. I couldn't understand how that happened but after that I noticed that it's happening with every post.Does anyone know why this happens and what is the cause of this?Maybe I am doing something wrong and tell if anyone is experiencing the same thing.
Im looking forward to see your replies.
Thankyou

Post Earning decreasing automatically? | Ecency