I m not sure wht kind of visa u hav entered qatar. maybe its a visa received on entry which might be valid for 14 days to a month.

Inorder for u to work in qatar , u need a work permit visa tht shud be applied by ur company. Maybe thts y they need to change ur visa.

u can check further the ministry of interior website on any website abut visas in qatar. but for u to be able to work in qatar, u need a work permit visa only n no other visa.

Hope this is helpful.