Change the defaults in the reserving temple names window.
I often discover an ordinance that is needed for an individual who already has other ordinances shared with the temple.
When I go to reserve that ordinance, the box stating that I wish to reserve those other ordinances for myself is checked, by default. By default, that box should be UNCHECKED.
I try to be careful not to reserve ordinances that I have no ability to perform, but it would be much safer if that box for the other ordinances was NOT checked.
As careful as I try to be, I occasionally have to review my reserved ordinances and discover ordinances that I have unintentionally reserved.