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This is perfectly OK. Many countries do not have any significant number of people who do not have surnames, so when transcribing such names into their computers they may take a variety of approaches, because their computers require something to appear in each field. For example, if you were to obtain a US visa, the the visa would show "FNU" in the given name field and your entire name would appear in the surname field. It is likely that something similar will happen with your name printed on your airline ticket, as their computers also require given names and surnames. As long as your entire name is there in either field and matches the name in your passport, it should be no problem.