"Possibly"???? that's not how system here works. HR's should know why the visa was rejected. They are not individuals, they are a company that's trying to get a work visa for u..
Anyways, type in ur pp number on MOI website and check if u have a valid visa in ur name..http://www.moi.gov.qa/VsaWeb/Actions?action=geteServiceVisaInfoInput&lan...
Check it and if u dont find anything in ur name then talk with HR about it..