Once a question has been tabled, the department concerned may transfer it to another department, on the grounds they are responsible. There is not much you can do about this, because transfers are a decision for ministers. It is a long-established principle that the Speaker does not intervene in transfers.
The Speaker expects departments to transfer questions promptly, which typically means within two sitting days of publication. A sitting day is a day when the House is meeting. Decisions on transfers should be consistent and you should receive notifications of any transfer from the departments concerned.
If an oral question is transferred, it will become a written question and you will lose your opportunity to ask it in the Chamber.