SharePoint 2013 Form -- Can a browser cause field sizes to display incorrectly or differently?

I have a Calendar List and I'm using the standard SharePoint form for adding/editing the data.  I have added a 'Lookup' field named  EMPLOYEE to the form but for SOME (only 2 now) people, that field displays at about 1/4" wide (see attached document for image).   I thought this might be a browser issue as it only happens on their computers.  However, it happens whether they are using Chrome, Firefox or IE.   Perhaps there is a setting in SharePoint or on the form that may be causing this for a few people.

On the attached document, I have 2 screenshots -- the first shows the 'very narrow' field -- the second shows the field correctly.

Has anyone had this happen before?  If so, were you able to figure out what caused it?

Any help would be greatly appreciated.
Linda QuintanaAnalyst, Business Process Development and Continuous ImprovementAsked:
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Linda QuintanaAnalyst, Business Process Development and Continuous ImprovementAuthor Commented:
The 'PERMISSIONS' on the list that this Lookup Field was referencing did not include some of the users.  Once I added them to the list with 'read only' permissions, the field size returned to normal and they were able to select the correct value.

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