service call twice

Hi

I have created one service which i am injecting into controller and consuming, i am accepting that may be that service will take some time and for that reason i want to to show preloaded busy indicator. for that purpose i am injecting rootscope into controller and using this model $rootScope.$pageFinishedLoading = false; and after completion of my service I am making true.
what i am noticing that its make my service call twice i am annoyed why so, then i noticed this piece of code has to do something with this

i am not sure its bug but is my goal to use that pre loader busy indicator i am making any service call, can you help me how to do that.

Thanks
Viv