Subscription to the channel already exists

[PalmaPedro]

Hi.
I often get these errors : Streaming channel error: Subscription to the channel 1/ds/IeovTUnIk//panel4/12345/12345 already exists

when i try to subscribe to a channel. Other times it's more strange because i would get the same error but for channel 5 and 8, which I don't really have, so where is this coming from?

1/ds/IeovTUnIk//panel1/5/8

The path is defined as /panel1/${dc_panel01.0}/${dc_panel01.1}