Did I get hacked or is this a glitch?

The same thing happened to 3 of my friends, their use invo's were left in tact but they lost all of their chairs and set up items and in these cases their nx and meso's were reduced to 1. But only certain items were gone. I had a feeling it was either a nexon glitch or a hack.

Not a glitch. I actually found who hacked me [or at least his/her mule] by searching my stuff in MTS, and this person seems to have hacked more people -in Bera-