Self assessment - including attachments

When "add an attachment" is selected it all works correctly, until you open up the attachment and review the content. For the "Main Tax" attachment all the lines are repeated 4 times and the totals are all multiplied by four. So the pdf file no longer looks like what is shown on the screen. This doesn't seem to happen with the Foreign Earnings schedule.

In order to get round this problem, I recreated the attachment separately by exporting the detail and renaming it. Then that was included as an attachment.

If this hadn't been done the supporting schedule wouldn't have agreed withe the main part of the tax return.

Is this a known problem or have I done something wrong.