So I flagged this question as being opinion based and the flag got declined, yet the question is currently [on hold] for being opinion based.
Has something gone wrong with the system?
Four possible reasons.
Declined by mistake. It happens.
A mod has a vendetta against you. It also happens. Often.
Some mods think flagging for close reasons should not be done and blanket decline. This is wrong.
But from the looks of it,
If you mouse over the time stamp on your declined flag, and compare it to the close time stamp of the question, they should overlap.
Edit: since it wasn't a timed out flag, then: