NPC grammatical error

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Date & Time: 2 June 2019
Frequency: Always (in game text error)
World name: n/a
Character name: n/a
Retainer name: n/a
NPC name: Yuki
Monster name: n/a
Class/Level: Ninja/65
Party or solo: Solo
In-game time: n/a
Area and coordinates: Kugane x:12.4 y:11.9
Housing: n/a
Steps:
1. Be a ninja :D
2. Do the level 65 ninja job quest
3. Talk to Yuki
*Add more steps if necessary

Connection Specs
- Type of internet connection/provider: n/a
- Modem maker/model number: n/a

■ PC Specs

(This is simply an error in game text - nothing else is needed.)

Yuki says (error in CAPS):

"Yes, thanks to you, my people are doing wonderfully. The only downside of it IS THAT all is that now I have to be a proper princess again...."

If the first 'is that' is removed, the sentence works. With it, it makes no sense.