I have a problem that when the hamburger menu is shown and then the window is enlarged it leaves hamburger menu still visible (without any formatting), it also shows the main menu. On the attached screenshot, you may have to look closely to see the menu due to color.
I suspect that you are trying to manually resize the menu back to desktop sizes after you have opened it on mobiles? This kind of behaviour will never be encountered by actual users, but you might want to try this CSS rule to force it hide on bigger displays:
@media only screen and (min-width: 993px){
.responsive-menu.active {
display: none !important;
}}