Originally Posted By: Gordon S
...But why are the note durations almost all alegedly the same when the notes clearly are not?

I'm not sure if this is relevant to your inquiry, but BiaB Notation entry is somewhat unique. It enters a note of a longer duration than expected which is subsequently shortened by the entry of either a following note or a rest. Also the selection of Mono mode may make a difference to how this is interpreted (see screen capture):

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