Lne 1 is also used for Scholarship income and other types of income. Scholarship income would show letters of SCH to the left of the amount. Other non-wage types of income have other letter abbreviations. If you add yours here in comments, we'll give you the definition of those eitters.
Of course, the first thing you want to double check is that you did not enter the wrong form of income under the W-2 section.
