Hi!
It looks as if your model lacks the raised commander´s front vision block which is needed to look over the EMES18 housing.
You can see it on this picture (and others on this side)
http://www.rommelkiste.de/Fahrzeuge/Leopard/Leopard1a5/Leo.jpgYou might check the assembly instructions if you accidently missed to add it. It should be there because it is part of the 1A5 improvement and is needed when EMES18 is fitted.
This looks to be the Italeri 1/35 kit? It should have the part in question included.
Andreas