The company Ten bought the Australian rights off - World Sport Group - bought worldwide rights in a ten year package
back in 2008. But recently the BCCI have tried to terminate this rights deal, and have now sold the international rights it to
the Times of India group.
Basically, the WSG
are suing the BCCI over the wrongful termination of the contract, saying that the BCCI had no evidence for its claims that it used in terminating it and are claiming they are still the legitimate rightsholders.
For Ten, this means they own rights that currently don't exist - they have a deal with the WSG and not with the Times of India group. So they can't broadcast the IPL because currently the contract is terminated, but no one can buy new rights from the Times of India group because it's uncertain if they should even have those rights.
The local Indian rights owned by Sony are unaffected by all of this and make up the vast majority of the money spent on the rights.
So in short, the BCCI are double dipping on the rights and Australian viewers are stuck in the middle.