cold call from nab

Got a call from NAB today.

I currently have 2 x loans with them. Both are investment loans back by home security.

One is a principal/interest loan at 6.32% and the other is an interest only loan at an amount somewhat higher than that. This one matures in January next year to the principal/interest terms of 6.32% also (or less if there is an interest rate drop next month).

Anyway NAB wants to combine the loans, waive the fee and offer me 6.08% variable.

Someone tell me what the catch is???

If I do it, it will be a home loan (I assume)... So where do I stand with the original investment loans which I'm claiming a tax deduction (income/dividend producing) from.

What am I missing?

I asked the bank and they said there is no catch.. Just offering a better deal to keep their customers happy.

Any advice would be appreciated.