Incorrect/ Inconsistent profit amount per single sale of listed item

My item is listed as $15 USD, yet per each sale I have made over the past few week why is the total sale price different? I understand there are jinxxy fees, but wouldn't all sales of the SAME Product have the SAME price even after the Jinnxy fee?

Here's some photos for your reference.

Each time I make a sale, its shown as follows: 11.82 / 12.26 / 12.03 (there are more that I have not taken a photo of but these are an example)

Meanwhile: its estimated as: 12.70 (after jinnxy fees) <- another thing is, why does the ESTIMATED total amount I'll get be changing as well? last time I checked it was 12.50, now at present its 12.70 (as of 15/9/2025)

These numbers above, they dont match or make any sense. Please let me know why these total sales numbers are so different per sale, how do they fluctuate what's the % of it that changes? how does your "estimation" process work? do you have more information for me to read on this matter?