Release code-Rel strategy

Hello SAP gurus,

I have created Release strategy in DEV,It is working fine there.The same release stregy i have created correctly in Quality.My problem is that the release code defined in release strategy in quality is not working fine,it is taking additional release code even it is not defined in release strategy,But it is working fine in DEV.

e.g.Rel strat. A1 Release code X,Y &Z

In QA it is taking Rel strat A1 Rel code X,Y,Z,M .the additional M which is there in the system but for other rel strategy.

Pleass suggest