Your menu has a lot of long words in them. When the space is all taken on one line, it will go to the next one. I have suggestions, but lease note that doing these will make readability harder for your customers (especially for those on smaller screens):
- Make the menu font smaller
- Reduce the padding between menu items
- Make the logo smaller to give the menu more space
I personally recommend doing any of these to keep user experience good:
- Reword the menu items to save space
- Prioritize which menu items to keep and which to remove
- Code in your own dropdown mega menu