This is a very quick and blunt question but here we have a deliberately incorrect notation and below it is the corrected version (the black circles).
How come the eight note before the last (the pink) still has a flat accidental? That Cb note has been covered by the key signature anyway. The natural ends its effect as soon as the first bar is over, so that doesn't explain why this accidental has been placed either..
The Cb note you mentioned is actually an Eb since this passage is in bass clef, not treble clef.
The accidental in bar 5 is a courtesy accidental (also called a cautionary or reminder accidental) and is not necessary but used to remind the player that the previous accidental has been cancelled. They typically are used a bar or two after the original accidental occurs (and preferably in parentheses) but sometimes they are used several bars after, as in this case.
For some reason the top line in written in some kind subbass clef (with a really weird key signature). So the the third space is a C, but the second line is written in bass clef where the third space is an E (not a C).
The second line has an E-natural because this part is playing in the scale of F harmonic minor.
The last bar has an E-flat which isn't strictly necessary, but is some what useful because it is clearly showing that we have modulated to A-flat major.
It might be more modern/sensible to put this necessary accidental in parentheses (as a courtesy accidental).
I think it's a coding error in the program that typeset the musical examples.
I wouldn't trust any music typesetting program that let me supply 8/9 as a time signature and then lets me enter bars of 9/8.
Furthermore, the accidentals in the first sample don't agree with the clef. What music program would let you write that? Here's what Sibelius does with Ab major key signature and the Archaic Sub-bass clef:
So I think it is a coding error that there's a courtesy flat in front of the E in the fifth bar, rather than some little-known rule of music typesetting.
