Hi Brian, is there a sample site that I can look at? Based on your current description, I am not sure about the specifics of the problem.
The plugins generally have no problem with any browser in particular. It sounds more like an incompatibility with the theme you are using.
Do you mean that when you press the tab button on your keyboard, the cursor skips the text field in which visitors are supposed to enter the anti-spam field? In this case, it would be related to the "tabindex" attribute, which you can either change or remove in the plugin code.