The recent listing on different exchange was the reason behind it.
But if I were you I would not expect too much and stress all about it. If you bought your 20m Inu at a small price then just keep it. No need to worry much. But if you are trying to make profits out of that token then trade it back and forth while the market of it is still this volatile. Soon, this hype will calm down and it's going to be another long shot before it shakes again.