IRCTC/online Ticket Booking — allotment o[censored]pper berth to senior citizen women- available berth 233

Address:

Ghaziabad, Uttar Pradesh, 2010101

This is not the first time, but most of the time when i book ticked for my parents, we are unable to get lower berths, even after total available berths are 231 nos.
I booked a train ticket for my parents on 07.02.2018 in the train no. 12314 sealdah rajdhani, from new delhi to howrah, place choice lower for passenger 1 and middle for passenger 2. At the time of booking total seat available was 233. But i got middle and upper berth.
My mother 67 years old allocated upper berth. It's very surprising, how can you think a senior citizen woman will climb to upper berth. If during so any mishappening, who will be responsible.
My request to improve the system and reallocate lower berth for my parents.