1 is probably not a bug but the nature of an envelope. You are just cutting the volume of the sound to 0, so unless the wave is at a zero crossing you will probably get a click.
2 I’d consider a bug but Elektron sees as a feature. Basically repeated notes use the same voice, regardless of the voice settings, to avoid phasing issues. The byproduct of this is that the start of one note truncates the release of the previous note. I put in a feature request to allow for repeated notes to use all a available voices