On a booking, why are there two values for Ticket Fee?

TTS Consolidator displays two fields for these taxes: one indicates the value predefined in the Fees management section (the non-editable value) and the other offers the user the possibility to charge a different value for that specific booking (the editable field).

To apply a different fee, change the fee value to the one you want to apply and click on the refresh icon next to the box. The fee applied and the total will be updated as you can see in the image below.

Note:
XP tax available only in specific markets has the same behavior.