Well, it could be fun! There are manga out there that focus on surfing and showcase the thrill and challenges of it. You might just discover a new favorite if we give it a shot.
Charmander can't go underwater in the manga. It's a fire-type Pok茅mon and water is its weakness. Plus, its physical characteristics and abilities don't allow for underwater survival.
I don't have the exact information. Sometimes these things happen unexpectedly. It could be a temporary glitch or a more serious problem that the site is dealing with.