Issue with notes going over the time signature

I think the program used to typeset the original score had issues with the alignment of distinct (sticks up vs sticks down) voices. I've modified the supplied snap to show how it should have looked:

There might an error and the 16th notes are 32nd notes.
Or the 16ths might be tuplets.
I'd notate it like this in the former case:

... and like this in the latter case:

Considering your other question (24 16th notes in a 4/4 measure; Tuplets?), I suspect that the alignment here is correct, and that these aren't true 16th notes but rather triplets. That would mean that the first part of each triplet should be a sixteenth rest, which would of course be aligned with the bass eighth notes, and that those rests are not shown for some reason.

So if this is from a pdf the original arranger has notated both hands in the bass clef (beat 1,2) and then both hands in the treble clef (3,4). This print was probably by "hidden" rests.

If you scan this sheet it will cause problems but if you edit this bar by hand you can solve them.

Both systems have an eighth rest on the first beat. The notes are on different layers. The most simple solution is: just give in the notes a new, 4 voices in 4 different layers.

alternately try:

1.

-> explode music (utilities) and see what happens:

-> choose different colours (view and select layer colours)

if necessarily edit the notation

-> implode

or try

2. menu Edit

-> edit measure attributes

-> Position notes (using beat-chart spacing -> according to time signature)

Because of the 8th note rests in both the treble and bass clefs on the downbeat the first 16th and 8th should line up. After that every other 16th should line up with an 8th note. You can also keep each hand in their respective staff by changing clef or using 8ba or 8va if you choose.

The blue lines indicate notes that happen simultaneously: