Hello @Annette70,
The thumbnail price is the fixed price + the per night cleaning fee and so is a valid estimate of the nightly accommodation price you charge.
For some reason no listing is shown when I go to your profile so I can't see if you have a cleaning fee and what your minimum number of nights stay is.
For example, if your fixed price is $105, one night minimum stay and a cleaning fee of $25 then the thumbnail would show $130.
If the cleaning fee is $50 and minimum nights stay is 2 nights then the per night average cleaning fee is also $25 so the thumbnail will show $130.
If that doesn't explain it then contact Airbnb.
Steve.