Please update the browser to the latest version, clear its cache (device settings - "Applications" - "Yandex. Browser" - "Memory", click "Clear cache") and restart the device. Did this help you?
Could you please provide us with a more detailed description of the problem and the steps you took before it arose in English? We need a step-by-step description so we can try and replicate the problem. It would also be helpful if you could send us some screenshots to illustrate your description. Thank you!