did you see the supplemental statement that was enclosed with the K-1 that gives the info for reporting the sale

capital gin

box 3  = sales price from 1099-B

box 6 + box 7 = cost bsis for capital gain. this is what needs to be reported for tax purposes. tghe 1099-B info is incorrect  - it will only indicate what you originally paid. 

box 7 enter on the disposition worksheet (you need to click the link for disposition and fill in info so prior passive losses are allowed) it as sales price. use basis = 0. enter ordinary gain same as box 7 (this l flow to form 4797 line 10 

TT does have a good way to enter 1250 gain   so what I do is enter the amount on line 9c of k-1and then go to addl info 1 use quickzoom below line 11. enter the 1250 gain in box 9c  line 3 this should flow to line 10 of 1250 gain worksheet.