Created a chart in excel, however cannot see columns. Tried fix with many suggestions, now worse.

I created a chart in Excel, however could not see any columns. Tried to fix with unhide, change column width and other suggestions. Nothing worked so I cut chart to try again. now only get one cell of data, that cell is circled in red. I cannot see how to remove the circle. Can you walk me through fix?

Thanks, Pam