Question Viotek 144hz Not Working

[Stainful]

I got a viotek monitor with the option to use 144hz, and got it working. But somehow it switched itself back off and down to 60hz. And when I go to change it, 144hz isn't even an option. I'm using a DP connection. I'm not sure what settings to look at to fix it.

 

[Glenwing]

Which Viotek monitor?

 

[Stainful]

Which Viotek monitor?

Viotek GFT27DB