I set the "spawn-protection" property to 64 while 1.9 was still in its snapshots, and it worked perfectly fine. The spawn protection was 64x64 blocks. But since one of the latest prereleases of 1.9, the server's spawn protection has been off. It's 80 blocks protected on the x-axis, and 16 blocks protected on the z-axis. But the y-axis is fine. It's always fully protected how it's supposed to be, at 256 blocks.

Probably unrelated information:
64x64 equals 4096
80x16 equals 1280
And when I set the spawn protection to 128, it was more than 64 on both axes, but I didn't count the exact amounts. It may or may not have been accurate. But putting it back to 64 spawn radius just went right back to the 80x16 protection. It's weird.

EDIT: This has already caused chaos in my server spawn area. Players are breaking blocks and building houses. It's getting really annoying. Please fix this soon!