Non-sticky header in tablet view

Hey,

I don’t want the mobile menu to be sticky. On my iPhone it’s not sticky but on my iPad it’s sticky. I already tried it with a code, but then I got an additional empty header under the correct header. Any suggestions?

Thanks in advance,
Marlon

@media only screen and (max-width: 989px) {
.responsive #top #header{
position: static;
}
}