Please go to Help > About Quicken and let us know what version you are running now.
When did you first see this problem? Was it before or after Mar. 4, when R39.17 was first released?
Previous to the current version, did you ever have R39.17 or R39.21 installed?
In the affected account, have you ever used the Paycheck Wizard to enter the split transfers in your paycheck?
Does the problem also affect the Account Balances Report?
If your answers are After Mar. 4, Yes ran R39.17 or R39.21, Yes have used Paycheck Wizard, and Yes affects Account Balances report, you have probably encountered the problem discussed here:
https://community.quicken.com/discussion/7909601/r39-17-r39-21-paycheck-corruption-edited/p1
Let us know the result and we can go forward from there.