Tickatus effect not matching the card text

I had an opponent play the Corrupted version of Tickatus, which reads, “Destroy the top 5 cards of your opponent’s deck.” It destroyed 10. I played Cold Storage on it and played it myself; 10 cards were destroyed again. I’m not even gonna argue about 10 cards being super-busted since HS devs love breaking their game nowadays, but can the text at least match?