We are aware of this bug and it is being fixed in an upcoming release.
Please note that Flash Player IS being upgrade, however, the entry for the previous version is not being removed.
There are several other discussion threads on this issue. Please follow Re: Flash player 188.8.131.52 not uninstalling 17.x and older versions during upgrade or Re: Flash Player 18 not uninstalling 17.x or older versions during upgrade as those two threads will be updated when the fix is released.
Cool thanks Maria .