I notice when using the arp on my Keystep Pro that the first note is almost always played twice.
For example...
If I hold down a C and D I will get D,D,C. After that it behaves normally while holding down those keys
If I hold down an Fminor (F,G#,C) I will get G#,G#,C,F. After that it behaves normally while holding down those keys
This issue repeats if I play a different set of notes.
My firmware version is 2.0.1 build 989.