The UI is in german but you can see that I have the Basalt Blooded Staff equipped as a motif and yet something else is shown. I don't know what it is, but this doesn't seem intentional.
On a side note, all I wanted from the basalt blooded motif was the staff and I got it next to the last one with only the 2h axe style missing. So you can imagine that it took me quite some time and effort to get it and that I'm not happy with this bug x)
PS: This bug also happens with the necromancer staff and not with other weapon motifs, such as the sword or hammer.