There are a variety of reasons you aren't getting even transponders.
1. Do you get evens from 110?
2. If so, what is the difference in strength between 110 t-11 and 1-12? If there is a significant difference you could have a cabling or connector issue.
3. What sort of lnb and switches are you using?
4. Do you have more than one receiver? If you do, is the problem on all receivers or just one?
A little more info will help diagnose.