Hello,
Firstly, your WoodMart Theme wasn’t updated to the latest version so we have done that. So, you can once again check the concern at your end.
Secondly, as we are viewing the multiple viewports of your Site the Header seems to be appearing fine. Here is one example: https://snipboard.io/VxdARU.jpg
So, if there is any sort of cache enabled on your Site. Please make sure to clear and flush it out completely from your Site and then check back the concern again.
If the issue still persists, then could you please once try deactivating all the third party Plugins on your Site, remaining the Theme required ones activated. If the issue gets resolved, then reactivate them one by one to see which Plugin is causing the issue. If this doesn’t work for you then once also, try to activate the Parent Theme on your Site if you are using Child Theme on your Site.
If somehow issue still persists, then please take complete Backup of your Site first, then provide us the permission to completely debug your Site which includes deactivating all the third party Plugins and removal of on-Site Customization changes too, so that we can thoroughly check this issue on your Site and assist you accordingly.
Best Regards.
.
