Your chip may be set to Long Addressing CV29 bit 5 set on 1. This means the address current is stored at CVs 18 and 19.
Reset CV29 bit 5 to 0 (the current setting minus 32) and set CV1 to address 3 and all should be well.
I'm not sure how this is done on a Multimaus, but the above should help.
Chris