There's a problem about N32 Shark Drake, when it destroys a monster by battle, sometimes it can't activate it's effect, even if the opponent doesn't activates any effect or the card doesn't say that it can't be summoned by special summon, until that problem gets solved, that monster sucks, because you don't know what monsters won't be affected, It happened to me a lot of times, I've lost some Duels because of that.
Could it be that you were using it with other Shark cards like Double Fin Shark and Saber Shark? If you used either of their effects, you're locked into special summoning Water monsters for the rest of the turn. That rule also prevents 32 from special summoning monsters it destroys other than Water attributes. Also, watch out for destroying monsters that can't be special summoned to begin with.
I know what you mean, but is not that, but it's solved now, I had that problem using the White Stingray + 4lvl Water monster+ Silent Angler combo, and I was dueling against Ojama and a few other decks to test it, but not anymore.
I had one time where that happened too. The effect just doesn't activate for whatever reason, and no, I'm not using Double Fin or Saber Shark's effect.
And the monster I destroyed was a vanilla.
I have this slightest feeling that it's probably Silent Angler being bugged, but in other times I used Silent Angler's effect, Shark Drake's effect does activate, so I don't know anymore.