Spawners use MobsPerSpawn option only once after reload

In the video I set the MobsPerSpawn to 5. After reloading MM, it only spawns 5 mobs once and continues to spawn only one skeleton after this first wave, instead of 5.

I tried experimenting with the values of the warmup time, maxmobs and mobsperspawn, but the issue seems persistent.

MythicMobs 2.4.5
Spigot 1.9.4

Spawner: http://pastebin.com/AFJhj70z
Mob: http://pastebin.com/6njWRyd8