The seller has lied about financial specifics, has not delivered documents as promised, and is not acting in good faith.

Unfortunately, in this business there are lot of scammers and dishonest people promising to make you a millionaire if you give them a ton of money to "guide" you etc..

The portfolio products that will lend to an LLC will generally want some combination of a higher rate (still well below hard money), points up front, an ARM, a promise from you that you will NOT move in, and a normal 25% or more down payment. 

You'll sleep better I promise. 

One of the things Joe Fairless mentioned in one of his podcasts was that everyone who meets with him asks how they can add value and promises to help.

I see a lot of online companies promising extremely attractive rates for conventional loans.

As @Jay Hinrichs and @Roman M. have pointed out it is indeed a very risky investment as most are that promise high returns.

Our deals are structured as ten-year deals, to give us flexibility, but we tell our investors that we would be looking to sell in the 5-7 year time frame.Just in case you are not familiar with preferred returns, they are the return that you promise to pay the investor before you participate in the profits.  

As promised, I did want to come back and give an update.

If you are legitimate, you will disclose the title problem and not make any promises that are out of your control to deliver.