Levamisole HCL weird smell

[helptoall]

Hi , Has anyone noticed a weried smell when he is mixing the levamisole with water? i have levamisole that ive used a few times befor, but today when i mixed it with water befor putting it the tank it started to smell really weired ,kinda like the smell cooking gas has. I did it a few times with diffrent cups and it happened the same-at the second the levamisole toucing the water it start smelling. I never noticed it befor but im not 100% sure that it didnt happened in the other times i used it, So i wanted to ask if anyone noticed it and if its ok to use it even with the smell.. thank you