Hello Ryan Becerra:
Thank you for posting.
Development and Testing was aware of this issue. I have added your post to the original report.
The problem manifests itself when web input field does not have any style attached to it. When this happens the default style applies the style property "border: 2px inset". It is this combination of property that causes the problem. Currently, the only workaround I can offer you is to add style to the input field.
Will this also happen with FileMaker 12, Mac?
Seem to be fixed:
FM 12.0v2 - Safari 5.1.7 - Mac OS 10.7.4 √