Assuming this is a 1065 K-1 (and it does matter) then we need quite a lot more details to be of any help. Amounts with code I are other items of income, gain, or loss not included in boxes 1 through 10 or reported in box 11 using codes A through H. The partnership should give you a description and the amount of your share for each of these items. Please see https://www.irs.gov/pub/irs-pdf/i1065sk1.pdf page 9 first column, "Code I, Other Income (Loss)"
Generally, if the absolute only thing reported on the K-1 is income derived from rental property, it should all be reported as such in box 2 and/or 3 of a 1065-K-1. For example, if the tenant was late paying the rent and incurred a late payment fee, that fee is included as rent for that rental period and included in the amount in box 2.
