Currently, the server has reached invasion +2 and we do not want to have more powerful items than that.

As we have already announced, Castle Siege is in BETA for the first 2 weeks. It is very clearly and precisely written that this event has not been enabled for 2 years and therefore must be played with caution.
No one reported the presence of a machine that gives items from +5 there.

In addition to the CS case: I (ANHI) and the GM team, we forgot to notice and change quests from which +3 and +4 items came. Because we adjusted a bit the reset scheme this season.

Today I took over 7 hours to fix these 2 things. More than 50 items were seized.

The compensations are as follows:

• For each item from BOK + 3 (Quest) -> 2 BOK + 2
• For each item of BOK + 4 (Quest) -> 2 BOK + 2
• For each item from BOK + 5 (CS Senior Mix) -> 2 BOK + 2, 35 Jewel of Bless, 35 Jewel of Soul, 1,500,000,000 Zen
• For each item that has been seized but has been enhanced (skill / luck / level) credits are returned +50 for each action

If this isn't enough for you, write in Discord in a channel and offer better compensation for an event that is in beta with advance warning in big white bold letters.

P.S. I'm just going to mention Rule 17. I'm just mentioning it.