Yes, it was like that only! Even I thought that only the masters would be evaluated, but I was surprised when I was asked to submit my Bachelorvs details and send the respective documents additionally in a sealed envelope from my issuing institution. Due to this only, my ECA was delayed as they took a while in responding to WES (more than a month). Whereas my Master's institution responded to WES within 1-2 weeks. The whole process took more than 4 months!
I thought that it was their policy. But you guys are saying, WES don't ask a thing about the Bachelors during the Master's assessment!!