When we copy cells from a table, Coda automatically also copies the headers for those cells. This breaks my user expectations because I didn’t highlight the headers, but I understand when / how it can be useful.
That said, when it’s particularly annoying is when I’m copying data from coda cells to paste into other coda cells. Those header values being automatically included end up overwriting cells I didn’t want overwritten. See this video below:
My suggestion: don’t include header rows when pasting into coda tables.