@vikbuddy is on top of it (see previous comment).

The first 150,000 VYB were exchanged for 37,500 POB (at the 4:1 exchange rate).

Most of the 92,000 POB you are seeing were used to claim VYB at the 3:1 or 2:1 exchange rates (using 'market' in the memo).

However, 50k POB have just been staked to @vyb.pob.aat. Those will subsequently be delegated to the VYB anti-abuse team (to compensate them for their efforts).