I see some similar anomalies also. I was able to identify a beginning date where there was a problem but there was not a problem starting with the following day. I tried to find a transaction at that date, but I did not.
I suggest you use the Portfolio Manager.
Investing->InvestingTools->Portfolio will get you there, but it is better to add Portfolio as a Shortcut to get you to the Portfolio in a single click.
At the portfolio, ChangePortfolioView->CustomizeCurrentView->PortfolioColumns
Select each of the seven TotalReturn items, and click Add. Also
select TotalAnnualizedReturn. These will give a much better view
of how each of your investments have been performing. You can
reorder them by selecting one in the DisplayedColumns and choosing
MoveUp or MoveDown. You may want to select CostBasis on the right,
and click Remove. That column is very meaningful for non-deferred
accounts, but you should not care about that column for a 401K.
When done, you can do SaveAs. Money will ask for a name for that
view. Then you will be able to select that view with SelectView in
the upper-left of the portfolio. Alternatively, click Save, and
the view that was in effect when you clicked CustomizeCurrentView
will be modified.
You can also reorder and resize columns by dragging the column
headings while viewing a portfolio.
Note the AsOf date in the upper right.