Project 2013 week numbering - Gantt chart on screen differs from print preview.

We are producing a gantt chart for a project.
The project is set to Start 06/03/2017
So week 1 in our heads is obviously week commencing 06/03/2017

However some prep work needs done 8 weeks before the project starts in earnest
So we have a task 1a that starts 6 weeks prior to 06/03/2017 eg 09/01/2017

When I add this task the weeks are renumbered so that that week 1 starts when Task 1a starts (09/01/2017) rather than what the project start date is set to (06/03/2017).

However when you preview/print it week 1 is indeed as per the project start date (06/03/201) and task1a is shown to run from -8w to week1

Project 2007 doesn't display this behaviour. On screen shows W1 as being 6/3/2017 and the print/preview matches. The issues is for Project 2013 and have been tried on 3 or 4 maghines all displaying the same issue.

How do we get the gantt chart to match the print preview/printout.

I've attached 2 images.
One is a screen shot from within Project
The other is a screen shot after having printed the doc to PDF - however the physical print out matches this.
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I can find a similar disparity between them and think there's a bug that MS ought to look at.

if you display week numbers without the W, set the fiscal year in Project Options and tick the 'use fiscal year' option when setting the timescale you might be able to get it closer to what you need
MajicthiseAuthor Commented:
Decided to live with "as is"

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MajicthiseAuthor Commented:
'you can't do that' is a valid response to the question
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