Why don't the Tories want their candidates to talk about Tory policy?

An article in The Chronicle Herald of Halifax says that two Conservative candidates were told by their party not to talk to reporters about an anti-same-sex-marriage meeting they attended.

Normally, a party puts the clamps on the mouths of candidates who failed to support the party’s agenda, but to silence candidates for supporting your agenda???? What gives? The Tories have never been shy about their opposition to same sex marriage and it’s a little late in the game to pretend otherwise.

So why are they muzzling these two candidates?

Any ideas?