I'm having an issue with appending memo fields in browser enabled info-path list forms that I can't wrap my head around. On certain field changes I have the old data in the field written to an appending memo field to capture the history of the field for view in the form, not version history (although I can see it there). What I have found is that in certain lists (this has and is happening in multiple lists) after 5 or so entries into the memo field it stops continually adding entries and will delete the oldest one, so the 5 newest entries are visible, but anything older is gone from the form at least. Version history on the particular list I'm referencing here is set to 10, not sure if that has anything to do with it.
I use this functionality quite a bit to capture the history without having to set the version history to unlimited. I've done multiple searches on this issue and have found nothing.