Hi there! Sorry to hear this is happening! Do you also see it in the prototype view? Which font is it?

At the first sight, it seems to be a rendering. To cover some basics, I recommend you to check the Figma browser requirement. Please check this help center article: https://help.figma.com/hc/en-us/articles/360039827194-Figma-browser-requirements#unsupported

For your information, GPUs have known bugs and may cause rendering glitches when using Figma. I would also advise you to reach out to the support directly here for help. Our technical specialists can have a deeper look at it here.