On my laptop, when scrolling fast through a question I asked on mozilla support community website (the question is mentioned in the screenshot below), a very small portion in the right side of centre, where the texts are.. suddenly turned to red... I don't know what portion it was exactly, but I definitely saw something in red there.. & the thing is, when i scroll slowly, there's nothing in red colour there.. so a portion suddenly turned to red when only scrolled fast. It could only be a graphics glitch or something wrong with the website right? and nothing else right?