Visa date of effect for ICT business Analyst

Request you to please elaborate on the “Visa date of effect” mentioned against the occupations for which the invitations are issued on prorate basis. Also, please let me know if invites were issued to all the applicants with 65 points till 18 may 2016 on invitation round held on 26 October 2016. Why is this date back to 15/03/2016 for invitation round held on 9 November 2016. Please refer to the links below for details: http://www.border.gov.au/.../9-november-2016-round... http://www.border.gov.au/.../26-october-2016-round...
Unofficial Skill Select Results from 29/3/2017 - These are an accumulation from sources in the industry, our own clients and various web forums and data bases. This table will be updated in the next few days if we see any other verifiable results... Accountants 70 21/10/2016 Auditors, Company Secretaries and Corporate Treasurers (24/12/2016) Electronics Engineers 60 14/12/2016 Industrial, Mechanical and Production Engineers 65 14/11/2016 Other Engineering Professionals 65 – 03/01/2017 - closed ICT Business and System Analysts 70 – 24/03/2017 Software and Applications Programmers 65 07/03/2017 Computer Network Professionals 65 – 03/02/2017 – closed