Problem with STW Hack

Hi, I have made a stw hack like this:

Nop(&Haddress,&H90)
Nop(&Haddress+1,&H90)
Nop(&Haddress+2,&H90)

but when I activate it i go under map...and I can't go up...why?

yeah because that is STW i use it like STW and WTW i dont know how to do separated but is better 2 in 1