Created attachment 86449 [details]
data obtained from https://catchchallenger.first-world.info/wiki/Quick_Benchmark:_Gzip_vs_Bzip2_vs_LZMA_vs_XZ_vs_LZ4_vs_LZO

using the attached data, I clicked in an empty cell in column J and selected Insert > Chart...
Then I clicked on XY (Scatter) and clicked Next>>
Then I changed the data range to be $Sheet1.$G$1:$I$46, selected Data series in rows, and checked both First row as label and First column as label and clicked Next>>

At this point I'm at the Data Series step of the wizard and there are 45 Data series, and for each one, there is nothing for the X-Values, so of course none of the symbols are plotted where they belong.

For example when you select the first Data series of gzip_1, you see the following:
Name - $Sheet1.$G$2 (this is correct)
X-Values - empty
Y-Values - $Sheet1.$H$2:$I$2

I expected to see:
X-Values - $Sheet1.$H$2
Y-Values - $Sheet1.$I$2