Maintenance for the week of April 20:
• NA megaservers for patch maintenance – April 20, 3:00AM EDT (7:00 UTC) - 12:00PM EDT (16:00 UTC)
• EU megaservers for patch maintenance – April 20, 7:00 UTC (3:00AM EDT) - 17:00 UTC (12:00PM EDT)
If the character is in the first slot try to shift it to another one and try it then - this sounds much like a bug based on that a lot of indices start with 0 instead of 1 - this is pretty easy for a programmer to use the false assumption and start with 1 whereas he should have started with 0.