I ran a search for this already, both here on these forums and googling it, and since I didn’t see anything on this, I’m certain I’m just missing something in the settings somewhere 
When I drag and drop, cut and paste, or simply copy and paste, within the same Scrivener document, the new text format changes. Sometimes it’s a different font, sometimes it’s just the font size, but I’m completely baffled.
Help?
Within the same Binder item, or within the same project?
Also, what platform are you on?
Within the same Binder item and on Windows.
Likely, your default formatting is set to other fonts and font-sizes than your copied and or pasted text.
The default formatting for NEW documents is in File > Options > Editing > Formatting.
To apply the default formatting to existing documents, select those documents in the Binder and select Document > Convert > Text to default formatting. A popup will ask you what exactly you want to update. Press Enter to apply the default formatting.
Hope this helps
It wasn’t copy-pasted text, interestingly.
However, it appears the issue was resolved by creating a specific style to apply to the binder item rather than leaving it as “No Style.”
And by doing that, you are storing potential headaches for yourself down the line. Although those used to Word expect everything to have a style set, the point about Scrivener is that “No Style” gives it the flexibility to compile to different formats with whatever is the normal style in the given format. If you impose your own style, you have to adapt that to every different format you compile to.
Mark
If you have other suggestions for how to prevent it, I’m all ears!
Sorry, I’ve been away and am still not at my computer, but a first question is, what do you mean by “the same document”? Do you mean a “Binder document “, which is what the term is used for in Scrivener parlance, or do you mean “the same Scrivener project”?
Mark
I’ve tested this with one of the stock styles that changes both the paragraph formatting and text formatting (Code Block), and didn’t notice anything getting lost when using drag and drop to move the paragraph down a bit amidst other paragraphs.
Is there a specific style I should be testing with, or if it is one you created, what settings should I look at?