Monster spawners won't spawn mobs. Some specific ones work, but others don't

This may look like a duplicate thread, but it is not at all. I have been working on an adventure map and the spawners don't work. I made some that spawned skeletons with armor, and they worked perfectly. I then used an online tool to make a skeleton spawner that spawned skeletons with different armor. This spawner was broken. It would just twitch randomly. I tried editing the spawn cap and the spawn range. Nothing worked. The skeleton spawners that I mentioned before were still working, and they would even work if I spawned a new one in with a command block. I tried making a slime spawner with the tool, and the results were the same. The ones I get from /give minecraft:mob_spawner work. Before you tell me to do this, I used NBT tags in the /give and it still didn't work. Just a pig spawner. Anyone know how to fix this error? I have searched the web, and there have been no reports of it. I have found no way to fix this. Also, there is no exact command. All I know is that all new spawner setblock commands are glitched, the old ones work perfectly, and the custom ones cannot be right-clicked with a spawn egg.

EDIT: It happens sometimes when you use spawner tags, such as the spawner radius and maximum mobs.