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Here's a link that may be of some help:
How to Theme Up Lubuntu

There was an update of light themes (Ambiance and Radiance) a month or so ago and I'm assuming that the referenced bug was fixed by then.

This bug describes what I see:...

Could you please specify which are these "some programs"?
Evidently, others work okay?

What do you see versus what you expect?
When I select the Ambiance theme from "Customize look and feel", the menus are as shown in the images. Do you see or expect something different? The gtk2 apps...

Have you logged out and logged in again? Sometimes, that helps register the theme change.