die while riding skelly horse in spawn area in multiplayer

i have died twice in multiplayer riding a skelly horse into imediate spawn area, just says i died in the void, everything lost, 2 others have also died doing same. there is a red line surrounding spawn in point in a 50 block square riding skelly horse with saddle, outside this area there is no problem, skelly horses are also escaping a 3 and 4 block high wall, fences only keep them in