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The issue may be caused by a mismatch in the data types or format of the x-axis variable. For example, if the x-axis variable is a factor or character variable, the bars may not be aligned properly. In this case, converting the variable to a numeric variable using as.numeric() may solve the issue. Another issue may be related to the width or position of the bars, which can be adjusted using the width and position arguments in the geom_col function.