Answering wrong to the correct questions and answers (help!)

Hi there I brought 2 new pendulums a while ago although I hadnt used them at all since..
I cleansed them tonight before I used them and said my little prayer or whatever you call it, like always i always do before..
I started with the simple yes/no and I don't no/can't tell you questions when I began which all went just fine.

Until I decided to test them...
I started with is my name Casey? It answered yes (wich was correct)
Then I asked am I 20 years old? It answered yes (wich was also correct)
But they I asked if my partners name was bob? It answered yes (wich is wrong his name is graeme)..
Mind you there were complete stops between questions and answers....
Next I asked if my son was born in 2010? And it answered I can't tell you! (he was born 2008)....

I tried the same with the second pendulum and to my shock I received the same answers??? I have searched all over the web and cannot find answers...
Someone please help I'm afraid there might be something negative going on with my pendulums....

Also tonight the pendulum I always use would not budge tonight no matter how hard I tried to bond and connect with it....

Please help!,,