Unable to select checkbox in WinForms

Hi Folks

Another issue I have as I am working on winform task where I have 5 columns and 1st column is for checkbox .The issue is here If there are more than 10 rows/records than I am unable to select checkbox properly it just moves up and down and do not let me to mark check properly .I can select checkbox for 1st row but for second row and onwards facing difficulty . And also if I start selecting from bottom I can select untill 3rd row again it does not let me .If I have less than 10rows like 8 or 9 rows than I can select checkbox  from top ,middile or bottom easily .Please help me whta to check and how .It is very peculiar for me to fix it .