There is no limit to the number of nomination forms that may be delivered.
If a candidate or party is validly nominated by more than one form, the candidate or Nominating Officer (as appropriate) should choose which one of the valid nomination forms (the selected nomination form) details are to be added to the statement of persons nominated or the statement of persons and parties nominated (as appropriate) and the ballot paper.
If they cannot or do not do this, then you must choose which one of the forms will be used.1
If more than one nomination form is delivered and one of the nomination papers is invalid, that paper is excluded from the forms that can be chosen.
As long as at least one nomination form is valid, the candidate or party (as appropriate) can be validly nominated.