Indian Railway Catering & Tourism Corporation [IRCTC] — Erratic allotment of Berths

PNR No. [protected]. I booked a ticket online for me and my wife on 03.12.2015 by Konark Express in 3rd AC for journey on 03.02.2016 from Bhubaneswar to Secunderabad. The status showed 115 berths available. I opted for Side Lower and Side Upper berths. Given the no. of vacancies, I was very sure of getting the opted berths. But to my utter surprise I am allotted with berths 2 and 50, both middle berths. Is it not bizarre to get 2 and 50 when there are 115 vacancies. Where is 2 and where is 50 in a compartment. Pl check my PNR No. [protected]. Now I am bound to cancel my ticket and loose financially in that process. Can you pl tell me the basis of allotment of berths for online booking and help me get my chosen berth. Regards. Ramesh Mishra, Bhubaneswar, [protected]