Thank you for trying out Noblesse Oblige! What version are you playing? Do you use full-screen mode or windowed?
Viewing post in General Discussion: Share Your First Impressions of the Game!
Try redownloading from this link -
https://mega.nz/file/W9hChCzL#XdcHZwIwgAXTuAMLtlJitXNEUmv21s8dfMC49I5SvBQ
delete the previous installation, then extract this one and try a new game, if you continue having any problems, do not hesitate to write and I'll search for other causes of this unusual game behavior.