As the title is shown, there is a display error on Zandor 'Proofs of Mettle' exchanging



It is my second time on exchanging, as the image shown, I have 21,467,700 mettle and want to spent 20,000,000 mettle for 3 of 'Proofs of Mettle' .

But the window shows expend all of my mettle, 21,467,700 on the trade, but it really needs 20,000,000 so I think it is display error


Date & Time: 30/05/2021
Frequency: permanent after patch 5.55
World name: Tonberry
Character name: Maid Misa-erika
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: Lv80 Machinist
Party or solo: solo
In-game time: permanent after patch 5.55
Area and coordinates: anytime
Housing: N/A
Steps:
1. into Zandor
2. collecte the metttle over 20m
3. the display information shows you need to expend all of your mettle, it is not correct