Hi,
The delay in response is due to support holiday.
I checked your site pages and I think you have resolved this double header issue on your site.
https://prntscr.com/12r4l2j
https://prntscr.com/12r4fiv
https://prntscr.com/12r4gh2
After logging out -> https://prntscr.com/12r4nwt
For this issue _> https://prntscr.com/12r4iu6
please add this custom css code
.user_menu.active {
z-index:9999999 !important;
}