Your X axis is plotting Rbias. Click it (where the cursor changes to a ruler) and enter temperature as the quantity to be plotted.
When asking about LTspice sims, please post your .asc file, and link to any extra component libraries required. When asking about ploting problems, save the plot settings and zip up the .plt file with the .asc file. You can also include libraries and symbols in the zip, but please don't include the generated .raw, .net or .log files, as .raw files especially can get very big.
I've recreated your sim using the Vishay LTspice models mikerj linked.