Frame single-sourced to RoboHelp: numbered lists are wonky

I'm single-sourcing FrameMaker 12 files to a RoboHelp 11 project (the issue existed in previous versions of the products). Numbered lists aren't transferring correctly from FrameMaker to RoboHelp: there is no space between the number and the content. For example:

1.To use this product, click here.

2.Click OK.

I've attempted editing the Frame styles. The Frame style setup doesn't allow me to add extra spaces between the number and the content.

I've attempted editing RoboHelp styles and .css sheets. I'm getting a variety of wonky results (like a number that permanently defaults to 0 or no number at all).

Can you recommend any solutions?