I agree. There are two kinds of decal paper (actually four, if you count clear and white for each type of printer). Laser paper will not work in inkjet printers, and inkjet paper will not work in laser printer.
Also, there is a rumor that you do not need to seal decals made with a laser printer on laser paper. Not true, you must seal them with a clear overcoat just like you do with inkjet decals. Otherwise the decals will be very susceptible to the least touch or abrasion.