Why Update query is executing twice in this case even if called one time?

Question

Example 1=>
I have unix ksh file and I am calling sql file from it.
(table 1 contains 2 rows -
ID      Name
1 test't
2 Pet's
below sql statement is part of sql file:
update table1 set name = replace(name,'''','''''') where instr(name,'''') > 0 ;
2 rows updated.
2 rows updated.
--after this update I see name is updated to test''''t and pet''''s
(Problem here is I see 2 rows updated two times.even if there is one row its getting updated two times)
Example 2)
SO I have created other ksh and sql and in that sql I have written same update and its working fine.
update table1 set name = replace(name,'''','''''') where instr(name,'''') > 0 ;
2 rows updated.
--after this update I see name is updated to test''t and pet''s
Why there are 2 updates in first example?

Answer 1

Please always provide the required information (as said in the forum's stickies): at least sqldev, OS, JDK and DB versions.
Regards,
K.