Light brown leaves on Calathea, help needed 🙏

Hi everyone!
Any idea what’s wrong? Last night I saw 2 light-brown leaves, they were firm and looked and felt normal apart from the color. I cut them off, and now I woke up and fount the plant like this! The whole side of it looks like those two leaves I cut off now (obviously regret it now). I only brought her home last Monday.

Is this light/water or is she just adjusting? What should I do? Thank you in advance 🙏