A problem with adding videos

Hi,

I've noticed for some time that there are cases where the system doesn't allow me to add videos to the songs already posted when I try to edit them, giving me the message (for example) "Tags System cannot be longer than 255 characters but is currently 345 characters long."

Is it something for the whole site, or the problem is only mine? I'd be really grateful if someone can explain what does that mean and help, thanks! ^^