ZunShot uses the OCR engine built into Windows. Results depend on the installed recognition language and on the image quality.
The recognition language does not match the text. Choose the right language in the extract panel. If it is not listed, install it: Settings > Language > Install OCR languages….
Windows registers the OCR engine only when the language's Basic typing feature is installed, not just the display language. Open Windows Settings > Time & language > Language, pick the language, and add Basic typing.
More in the guide: Extract Text (OCR).