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Could you please share screenshot of that error message?

Now it works. But this is the second time I am using decency points to boost my post. I don't think my post is of lower quality. It is much better than the industry average. But I somehow I begin to belive that it will be returned again by Ecency. I have gone through the FAQ, I don't really find an answer specific to "why the decency points are being returned". I think you might want to have a check specific to my profile.

Refund happens if curators are not able to catch up with daily requests: https://ecency.com/faq#why-refund-points