TAH paid a 30c special dividend (Ex-div 5 March) so the "raw" share price fell accordingly, but Comsec chart uses "adjusted" prices to reflect these kind of one-off changes. In IB you might be able to change the setting whether you wish to show "adjusted" price.
As to which one you should use if you are trading from a chart... I'd stick to "adjusted" (i.e. Comsec version).
Thanks skc. Can't find the right setting at the moment, but will have a fiddle around to get it correct.