all you have to do is change
REM MOVEMENT!
position object 1, object position x(1), get ground height (1,Object Position X(1),Object Position Z(1))+20,object position z(1)
if upkey()=1
position object 1, object position x(1) ,object position y(1) ,object position z(1)+(2)
endif
if downkey()=1
position object 1, object position x(1) ,object position y(1) ,object position z(1)-(2)
endif
if rightkey()=1
position object 1, object position x(1)+(2) ,object position y(1) ,object position z(1)
endif
if leftkey()=1
position object 1, object position x(1)-(2) ,object position y(1) ,object position z(1)
endif
REM MOVEMENT END
to
REM MOVEMENT!
if jump =0
y#=get ground height(1,object position x(1),object position z(1))+25
position object 1,object position x(1),y#,object position z(1)
endif
if upkey()=1
position object 1, object position x(1) ,object position y(1) ,object position z(1)+(2)
endif
if downkey()=1
position object 1, object position x(1) ,object position y(1) ,object position z(1)-(2)
endif
if rightkey()=1
position object 1, object position x(1)+(2) ,object position y(1) ,object position z(1)
endif
if leftkey()=1
position object 1, object position x(1)-(2) ,object position y(1) ,object position z(1)
endif
REM MOVEMENT END
i dont know how i did this but it works for me LOL