some of the material name is unmatched with the correct one. We have identify the problem and the bug will be fixed in next update.
For the boots, players may get them from our credit mall, may be you encounter one player who win our gift.

i treat that player as a friend (not the one who created a new guild coz he thinks he's so cool now) so i won't be dwelling on this subject but during our conversation, that equip coming from the credit mall was never mentioned by him/her. I was advised that it was from upgrading.. so there...

The item name may be wrong, Strength Soul Crystal VII may be wrongly typed in to Strength Soul Crystal VI. So there may be 2 Strength Soul Crystal VI but it's 2 different things.
So what you make out of Red Strength Essence VII and Green Strength Essence VII is Strength Soul Crystal VI (the wrong name for Strength Soul Crystal VII).

The player may be accidentally use the Strength Soul Crystal VI(actually the Strength Soul Crystal VII) to upgrade his equipment.

Sorry for the bug. We have report it and send it to the developer.

i repeat... although i know it looks like a typographical error.. the npc upgrading the hero armor registers it as a wrong item.

i tried everything on this one but it didn't work.