Hello,
I see on 11 PC that after deploy Mozilla Firefox, like tutorial, version before stay in program list.
Today I deploy Firefox 58.0.1 and on this 11 PC is still present Firefox 57.0.2
In one PC I made uninstall (in Windows Programs and Features) of Firefox 57.0.2 and after all is good with Firefox 58.0.1
And I have no idea why this happens only on this 11 PC and not on other as for all I did it in the same way
And if is important all PC are Windows 10 Pro