There's a limit to the number of characters that you can enter in the
Data Range box.

As a workaround, you could define the range of cells that you want to
use, and enter the range name in the Data Range box. There are some
instructions here for creating a named range:
   http://www.contextures.com/xlNames01.html

Or, create a summary table on the worksheet, linked to the data, and
create the chart from that table. To create a summary table, enter
references to the data in a contiguous range of cells. For example, if
the data for a chart is:

Series1: A5, C5, E5, H5, L5, T5
Series2: A9, C9, E9, H9, L9, T9

You could create the summary table starting in cell V2:

In V2:  =A5
In W2:  =C5

etc., to pull all the data into a contiguous range.
Then, select this range, and create the chart.