Font changes in Published Repeater

I use a repeater as an index in a static page, to display a list of filtered items.
I used Helvetica Light 22 points for the repeater elements.
Surprisingly, the font in the Published version is different than the one I defined. It works properly in Preview mode.
BTW, I actually have two repeaters for two different languages. The problem occurs only in English.

Here is the repeater in Preview mode:

And here is the published version:

I would appreciate any idea what might cause this difference and how to solve it.
thanks,
Ofer