Strange yahoo behavior! - Help!

[trafixltd]

hi,

very strange thing has happened.
yesterday, my site's home page lost its description and the title changed from the original title of the site to a different one.

it happened on yahoo.com, yahoo.co.uk and other yahoo datacenters.

all the other site's pages has their titles and descriptions with no any change.

the site has over 500 indexed pages and is a rich content with no spam technics.

after the change, the site moved up a few positions.

did anyone see this behavior befor?

Thanks :-)