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Reason behind this is that, organ perform more than one function. And if organ is made up of only one type of tissue, then how it perform various function.
For ex. Stomach. The main function of stomach is digestion. Bus stomach digest different types of nutrient such as carbohydrates, protein, fat etc. And all nutrient is digest by different type of enzyme which is secreted by different cells of stomach. Such as HCL is secreted from parietal cell, pepsinogen is secreted from chief cell.
Suggest, if stomach made up of one type of cells or tissue, so how they perform their function of digestion of different type of nutrient.
Thatswhy a organ made up of different type of cell.
Summary of above discussion is, organ is made up of different types of cells(tissue) to perform various functions.