I've got a spreadsheet in Excel. I've created a graph from the data. All the data is formatted as numbers.
When you look at the data labels the numbers for the lowest line match the scale of the axis. Thus if you look at the dark blue line, the data range from 6.4 for the first data point to 6.7 for the last. It looks like those match the axis.
The next data line in a rust color shows a first data point of 21.5 and a final one of 11.2. In that line, you see a number of data points with values below 15 showing up above the 20 mark on the axis.
It gets worse from there with the final data line, the top one (in goldenrod) showing data that range from 13 for the first point to 14 for the last one and nearly all are above the 80 mark on the axis.
What gives? Below are images of both the data and the graph.