Changing Key Signature removes some "Voice 2" notes.

So I'm shorting my measure from 63/1 to something like 8/1. In this measure, I use 3 voices. When doing so: the notes of Voice 1 remain & its rest is removed (which is desired). However, I loose the last voice 2 note (that was under the last voice 1 note) and now I cant place a voice 2 note there.

What is does is allow me to place (and replace) a 2nd note for voice 2 in the previous beat.

Voice 1 has 33 beats/measure and more can be added.
Voice 2 & 3 seem limited to 32 beats/measure.

Why? How?

• I'm copying a lot of music from a booklet, note-by-note, page-by-page.
• Most of the music does not use measures so I'm using the "63/1" workaround, then copy/paste to seperate measures so it's not all crampt, and then re-sizing the measure down to something around 8/1 or so (depending).
• I'm dealing with the first measure.
• For every note in voice 1, there is an identical note (different pitch) in voice 2 (so I would expect to be able to place a Voice 2 note under the Voice 1 note, being at an identical beat).
• Now, if I enlarge the measure (adding unnessassary white-space), I still can no longer add notes to voice 2.
• Voice 3 is acting like voice 2.