Hmm I am not super familiar with winbugs but I think I get roughly what is going on here. What does t[i,k] look like in their case? In the first code you have supplied they are different files but in the text file you have attached it is always 0 and 1 which might be a mistake?
blocker_string="""
study,na,r1,r2,n1,n2,t1,t2
1,2,3,3,39,38,0,1
2,2,14,7,116,114,0,1
3,2,11,5,93,69,0,1
4,2,127,102,1520,1533,0,1
5,2,27,28,365,355,0,1
6,2,6,4,52,59,0,1
7,2,152,98,939,945,0,1
8,2,48,60,471,632,0,1
9,2,37,25,282,278,0,1
10,2,188,138,1921,1916,0,1
11,2,52,64,583,873,0,1
12,2,47,45,266,263,0,1
13,2,16,9,293,291,0,1
14,2,45,57,883,858,0,1
15,2,31,25,147,154,0,1
16,2,38,33,213,207,0,1
17,2,12,28,122,251,0,1
18,2,6,8,154,151,0,1
19,2,3,6,134,174,0,1
20,2,40,32,218,209,0,1
21,2,43,27,364,391,0,1
22,2,39,22,674,680,0,1"""