Do you have All securities selected? There may be some confusing numbers if not, especially "No Security (includes cash)"
I just tried this using my Quicken (same version) and didn't see what you're reporting. Does this report happen to be a saved report that you saved in a previous version of Quicken? For whatever reason "upgrading" has been know to make saved reports go bad. If that's the case then re-do the report using your current version.And, the old standby: File > File operations... > Copy, then validate the copied file.
There should be a checkbox in the Customize dialog / Advanced tab to "include unrealized gains".Uncheck that and see what that does ...
I have seen this in the Networth report every year that I have beta tested. I never have future transactions in my investment accounts, so that is not it in my data file. There are no placeholders. Dev has gotten copies of my file in years past (not lately) and never get back with me as to what the issue is and have never cured it.