Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :)
I saw the screenshot you attached. Please Go to Appearance >> Menus >> Edit categories menu.
And make sure that you have added the Product-categories to the menu correctly.
Then make sure that you have enabled the categories menu for mobile and choose the correct categories menu to display for mobile.
Screenshot for Clarification: https://ibb.co/bmHntBt
Then Clear cache and check back.
Regard’s.
Xtemos Studio.