Text is not visible completely due to fixed height of labels. The below character of each word in "खुली & हुई" is improper due to height of WelcomeLabel2. The language is Hindi. I used the same .islu file available on Inno Setup official website. In other languages like French, German etc., the text is correct.
[Languages]
Name: "hi"; MessagesFile: "D:\Hindi.islu"; LicenseFile: "D:\license-hi.rtf"

I see the same problem even in Windows Notepad, when I open
Hindi.islu:So it seems to be problem with the font or Windows rendering of the font. Not Inno Setup issue.
It cannot be due to height of
WelcomeLabel2as its height spans all three lines. There are not separate labels for each line. SetWizardForm.WelcomeLabel2.Color := clRed;and you will see: