vokoscreenNG is a powerful screencast creator in many languages to record the screen, an area or a window (Linux only). Recording of audio from multiple sources is supported. With the built-in camera support, you can make your video more personal. Other tools such as systray, magnifying glass, countdown, timer, Showclick and Halo support will help
I can't do anything with this little information, let alone reproduce this problem. Therefore, you should tell us everything about your system and procedure.
Special thanks to Matthias Mailänder for this outstanding work, who made this possible.
https://flathub.org/apps/details/com.github.vkohaupt.vokoscreenNG