Yahoo's adjusted close prices

I am looking Volvo's stock prices around the dividend on the 5th of April:

http://finance.yahoo.com/q/hp?s=VOLVB.ST

The close price moves:

579 -> 581 + 25

Where 25 is the dividend.

This corresponds to an increase of 4.6%.

However the adjusted close price moves:

94.40 -> 116.20

Corresponding to an increase of 23.1%.

Can anyone explain this?

Are the adjusted close prices from Yahoo unreliable or what else is wrong?
 
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