Opportunity History Getting Deleted

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Our opportunities in the workspace are projects that often take many months, or even a year to complete. We are starting to notice months of notes being deleted off the beginning of the history on the opportunity file. Its a really big problem, as we often have to reference much older notes or emails.

Here is a screenshot of the section I am talking about.

Its almost as if some opportunities have a max limit for notes because others still have notes going back a year or more. Where one important opportunity just lost everything up to December.

As I said, this is a huge issue for us. We are going to have to start spinning up alternate servers to reference old information really soon.

We did some testing and it looks like the older notes are still saved somewhere, but not being displayed. We deleted the oldest notes and refreshed the page, and older notes showed up to replace them.
Is there a limit on the amount of history that can be displayed in an opportunity? Or is this a gitch?