Line spacing different for no apparent reason

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: intel

I have a style called Quotes.

It's set to a line spacing of 1.5 lines.

In a 200-plus page do***ent, there are dozens of passages with this style
applied.

One paragraph with this style has line spacing that appears to be twice as
large as the style calls for.

But when I look at the paragraph palette and compare settings for this
paragraph to any other paragraph with this style applied, there are no
differences at all.

I feel dumb, but I've searched and cannot find anything different about
the two paragraphs.

To fix the problem I set the style to Normal and manually set the font,
indentation and spacing the way I needed it.

An hour later, when reviewing the do***ent, I discovered a similar
occurrence with just one paragraph in a different style.

Is this an indication that my do***ent is becoming corrupt?

Is there a known fix for this?

I'd love to know what's happening here.

Thanks for your help.