How can a metal spring shrink to 26% on Mars?

How can a metal spring from Phoenix Mars Lander shrink to 26% in a
hole on Mars ?

NASA claimed a metal spring fell into a hole on Mars (Ref. 1). That
metal spring was 0.95 cm while on Phoenix deck (Fig. 1). However, the
“metal spring” shrank to 0.25 cm in a hole on Mars (Fig. 2). How come?

Ref. 1: NASA press release with photo:
http://www.nasa.gov/mission_pages/ph...ess/13278.html

Fig. 1: shows biobarrier metal spring on Phoenix deck measures 0.95cm
across:
http://www.wretch.cc/album/show.php?...55351395&p=105

Fig. 2: shows a second “metal spring” on Mars ground measuring 0.25 cm
across:
http://www.wretch.cc/album/show.php?...555230191&p=65

Fig. 3: Illustration on NASA photo in Ref. 1:
http://www.wretch.cc/album/show.php?...55351396&p=106