Vindictive Combatant's Silk Trousers shows missing, but at wardrobe showing I collected those. Have I only care about my main ticked.

It shares appearance with Fearless Combantant's Silk Trousers and I have this with my alliance mage.

You mention you have "Fearless Combatant's Silk Trousers". Are you missing the "Vindictive Combatant's Silk Trousers" on the horde or alliance side? It won't check off the ones that belong to the opposite faction since you are unable to mog that "specific ID".

Also, which version are you running? v1.5.5 cleaned up a lot of those appearances in the tooltip.

v 1.5.6 its not showing anymore. Both are alliance side as I mentioned first. But thanks for answer anyway.