it actually positive. please correct me if i am wrong. I got the K1 too. and on box 11. it's losses. So this can be use to offset income when filing tax. it's as if you have a company and the company loss money.
Check out Section 11, it should show your investment amount(Capital contributed)and an Ending capital account. That Ending capital account $ amount is what you need to show as a cost basis on your Schedule D.