Hi , I'm afraid it's a bug that has been there since version 2 . i have asked for this to be fixed many times but spark has been put on the back burner for now .
I hope its fixed soon
Arturia Tester for spark,analog lab2,kl88,matrix12,semv,beatstep,minibrute.se,
ASC,Vcol4, Beatstep pro, VCOL5, Synclavier v.