Don't know. I was curious and logged in again and saw what you were referring to, which was at odds with the intra-day quote screen price action that I witnessed in real-time throughout the day and also the course-of-sales screen, which accurately showed closing auction trades of $4.18. While I was bouncing between the quote screen and course-of-sales screen the quote screen updated (a few minutes ago) to reflect the accurate closing price ($4.18). Login again and have a look. The anomaly we both saw might have had something to do with after-hours ASX system maintenance.
GXL Price at posting:
$4.18 Sentiment: None Disclosure: Not Held