How to set channel position correctly?

[deso85]

Hello everyone,

I tried to set a channels position:
channel.getManager().setPosition(14).queue();

I don't know why, but the channel ends up on position 20.

My goal is to move a channel under another specified channel with a text command:

TextChannel chanA = message.getMentions().getChannels(TextChannel.class).get(0);
TextChannel chanB = message.getMentions().getChannels(TextChannel.class).get(1);
chanA.getManager().setPosition(chanB.getPosition()+1).queue();

Thanks in advance for your help!