Steps to reproduce

• Include a Twin Column field in the first tab of a content app (contacts app, for example).
• Open the content app

Expected results

The boxes appear aligned

Actual results

Boxes width is 100% and appear disaligned. It changes if you click on a diferent tab and come back or if you refresh the page.

Workaround

1. Do not include this field in the first tab but in a different one.
2. Override info.magnolia.ui.form.field.factory.AbstractFieldFactory.createField()

Development notes

It seems that width=100% is set in info.magnolia.ui.form.field.factory.AbstractFieldFactory.createField() the first time, later it will be overriden an correctly displayed.