Lender is asking me to refinance after 1 yr in a 30 yr mortgage

[Gustavo Gonzalez]

Here is the scenario. My lender for a triplex that I acquired February 2013 contacted me and asked if I would be willing to refinance my current mortgage to the exact same terms and they will cover all the costs of the refinance and will also pay one of my monthly payments. Per the mortgage lender whose CFO contacted me, they admit to a mistake where my original loan approval should have been for 70% not 75% the way they packaged my loan. He stated that Fannie Mae is asking them to repackage my loan - I have never heard of such a thing. So my concern is that as nice as they are trying to be, this really isn't to my favor. What comes to my mind is that it will reset my loan term again to 30 years where I have already paid 1 year of principal and interest. All thoughts appreciated!