Fields' Indicator might shrink a field's width in two times because of "display: table-cell;" CSS rule
http://forums.ext.net/showthread.php?60062
Here is a related post. http://forums.ext.net/showthread.php?59251&p=274275&viewfull=1#post274275
This forum thread was raised about this problem: Mandatory fields in FormPanel expand when with specified Width and IndicatorText declared.
Version: 4.1.0. The error is triggered when Ext.net.Indicator.updateIndicator() hides the indicator, for example, when validity status of the field is invalid.
Edit: as this error is not really the same, nor the workarounds in the original thread apply for this specific topic, an issue was created to track the specific problem.
Yet another one about this, albeit slightly different: Labels are cut after opening new tab from Grid