your website uses the mobile menubar.
which you can show/hide in customize -> mobile -> mobile menu bar -> hide

This bar is overlaying the top of your mobile website. Usually, this bar pushes the whole layout down which is correct

i did try to fix this with the update i released yesterday.
you can try and see if that update fixed it for you.

if you like you can also turn off updates in lay options -> disable updates

you can find the setting by searching for it in the search bar.

repair worked with

<script>
document.addEventListener("DOMContentLoaded", function () {
document.querySelectorAll("img[data-src]").forEach(function (img) {
if (img.src.indexOf("data:image") === 0) {
img.removeAttribute("sizes");
img.src = img.getAttribute("data-src");
}
});
});
</script>

and with

@media (max-width: 600px){
.cover-region {
top: 0 !important;
}
}

but I guess those were bugs?