Hi, I have just checked your listing and I see the price in £GBP.
There are normally two options to change your currency, one of which you mention you have checked but as I'm not sure which you refer to I'll list both options below -
1) Scroll to the bottom of your listing page on the left hand side right underneath the language box, there is a currency box, you can amend it here
2) Follow path below -
- Host
- Manage Listing (click on your listing and it will open default calendar page)
- Price setting (top right hand corner, click on it for dropdown menu)
- Base Price
If all fails contact Airbnb via one of the options provided in the link - Contact Airbnb
Hope you sort it out soon,
Ama