question about custom intruction

Hello

i have built a system with two custom instruction which drive an external block. i have chosen to export the signal clk_en to control the block when a custom instruction is called by the software. I remarked that the block receives the exported signal from the two custom while only one custom instrustion is called in the software.

could error come from my code?

if not

Does A cpu generate only one signal clk_en for all his custom instructions?

how a custom instruction which is not called can export the signal?

thanks