Welcome Lory,
I can’t recall receiving reports of random word spotting with OpenEars, but if you are receiving poor accuracy levels it is usually due to testing on the Simulator, or having typos in your language model, or using trying to trigger recognition using speech which isn’t represented in the language model (this can happen if you unintentionally haven’t used the language model you’ve thought you used, or if your language model happens to contain a different set of words than you are expecting, perhaps due to a minor logic error). Accuracy can also be significantly reduced with certain non-US accents if that is a possibility.
In order to fix your issue with your Rejecto install, take a look at the tutorial instructions again, paying special attention to the one regarding setting the “Other Linker Flags” build setting to contain the -ObjC flag.