Here is the website xxx.devshift.co.uk.
here is a script which I use
The script is pretty simple, but the element that should hide still displayed or hidden after a small scroll and after 595px appears again. Here is the photo of the item which needs to be hidden. If you scroll a bit down and up at once he will disappear and appear according to the script. But I can not understand why it is displayed immediately. after all, he should not. Prescribed script where possible did not help
Is it possible that this is due to the fact that the item was originally written display: flex; ???