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Looks like you didn't hit the threshold yet. We only attempt a withdrawal when it exceeds your desired balance by 10%. We might improve that to make it less confusing soon.
For example:
oh okay, that's a bit confusing, why not just the desired balance
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Because it's your desired balance so we need to exceed that by some amount to withdraw anything :)
Desired balance means that's the amount you want to keep on SN.
But I was also initially confused (still am).
But we will probably make the "exceeded by" amount configurable in the following iterations.