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As per my opinion, there is nothing wrong in this situation rather it gives versatility in the professional career. The diversified experience makes one the potential source for his employers, who can lead his organisation towards excellence.
If I give the example of my professional career, I mastered in Finance and Economics. I have served in Accounts and HR Departments of a govt. organisation in Pakistan for more than thirteen (13) years. Afterwards, I switched over to the Consumer Banking of a private bank, where I have been serving for the last six (6) years. Even I had no previous experience of Consumer Banking, I have been the top performer for the last five (5) years with a huge difference with my rivals.
Hence, the thing that makes the difference, is attitude only.