Your tickerservers are sending wrong exchange rate.
Request on
https://mtgox.com/code/data/ticker.phpReponse:
{"ticker":{"high":6.00774,"low":6.00774,"avg":6.00774,"vwap":6.00774,"vol":1,"last":6.10819,"buy":5.95921,"sell":6.10256}}
Probably is related to the exchange putting into production support for additional trading markets. For example: