According to the prospectus, if you are eligible to receive The Rights Offering, you have been issued Rights equal to the number of shares which qualified you for the offering. Each Right may be purchased for $2.75 and the buyer will receive 1.1526 shares for each Right purchased (although the company will round down partial shares). You may buy some, all, or none of the Rights. If you buy none, the Rights Offering will simply expire on Oct 2.
I believe the purchase of 'extra' shares you refer to relates to the Oversubscription Privilege. IF you fully execute your Basic Subscription Rights (buy ALL of the Rights you see sitting in your portfolio), you THEN may request to buy ADDITIONAL Rights, up to the number of initial qualification, and they will be provided IF available. If not enough shares are available to fill everyone's Oversubscription requests, orders will be filled in proportion to the shares you own relative to everyone else making the request. The Oversubscription Rights must be paid for up front, and if your request cannot be completely filled, that amount of your money will be refunded.
I recommend that you read the prospectus, and discuss it with a financial planner. My guy said this was new territory for him, so be careful. It doesn't surprise me at all that TDA and other online brokerages aren't much help.
I will also say this feels a lot like a carrot on a stick,and an easy way to get way in over your head. Be very careful.
