Thank you for contacting us about this issue.
RadRichTextBox is designed to be more like word processor rather than html editor. In word editor there is more indentation available to the paragraphs then there is in the HTML format. This is the reason why we try to combine the available indentation from the HTML format in a way most suitable for the exported content. In some rare cases the indentation is not recovered at fill percentage when the exported html is imported again. The described issue is one of those cases. I am afraid that for your particular case there is no available workaround.
However I will logged this issue in our feedback portal, where you can track the progress of the issue. Here is the link
Please excuse us for the inconvenience.
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