Server table rows permanently fixed (cannot be deleted or truncated)

PostgreSQL version 12.2

*Problem*
I am unable to delete or edit a specific range of table rows (I'll call
them corrupted rows) for a specific primary key. If I truncate the entire
table, the corrupted rows remain. In the corrupted rows, I can successfully
update non-primary key fields, but not primary-key fields.

*Miscellaneous*

1. The problem does not occur on a test server using the same exact
table.
2. If I rename the table, I can remove the corrupted rows and/or update
the primary keys (such as changing the DateTime). However, when I rename it
back, the corrupted rows reappear!

*Table info*

CREATE TABLE public."NCAASchedule" (
"GameDateTime" timestamp NOT NULL,
"Week" int2 NOT NULL,
"HomeTeam" int2 NOT NULL,
"AwayTeam" int2 NOT NULL,
"Line" numeric(5, 1) NULL,
"OverUnder" numeric(5, 1) NULL,
"HomeTeamScore" int2 NULL,
"AwayTeamScore" int2 NULL,
"OpeningLine" numeric(5, 1) NULL,
"BowlID" int2 NULL,
"Control" int2 NULL,
CONSTRAINT ncaaschedule_pk PRIMARY KEY ("GameDateTime", "Week", "HomeTeam",
"AwayTeam")
);

Thanks for any help you can provide.

Fred Williams