Why does my output on sqlite inner join multiplies?

I have 2 tables..

i will represent the data inn array....

table1 columns are t1_id, t1_value

table2 columns are t2_id, t2_value, t1_id(FK)

1. 
   

   table1={{1,data1},{2,data2}};

   
   


2. 
   

   table2={{1,d1,t1.1},{2,d2,t1.1},{3,d3,t1.2},{4,d4,t1.2}};

   
   

i have a query of..

rs = stmt.executeQuery("SELECT t2_value FROM table2 INNER JOIN table1 ON table2.t1_id=(SELECT t1_id FROM table1 WHERE t1_value='my_value');")

I got the right value i needed but instead of just..

d1 d2

what I got is..

d1 d2 d1 d2

please help??