Sundial- Stasis: Creatures do not attack for 1 turn.
Firstly, the text says creatures, not weapons, so weapons inflict damage like normal from the weapon slot.
Secondly, the text description doesn't take the time to specifically point out whose creatures it affects, so in other words, Sundial stops ALL creatures (both yours and your opponent's) from attacking for one turn or until it is destroyed. The card worked like it was designed to; not a bug.