The officer only contacted my previous employer because it relates to my NOC which is 1241. My previous employers who were not contacted, do not relate to my NOC. She did say that she was only contacting that employer for confirmation.I am facing the same situation as well.
My current employer received email from AINP to validate my employment and job title. I wonder if AINP sent to my previous employers as well.
This is good news for you. You should be receiving your nomination very soon!