[sqlite] why primary key can changed?Id changed is 2, is bug?(UName is unique)

[get bridges]

create table IF NOT EXISTS Unions
(
    Id integer primary key autoincrement,
    UName nvarchar(500) unique,
    Filter bit not null default 0
);
 
replace into Unions(UName,Filter) values('a','True')--Source Id is 1
replace into Unions(UName,Filter) values('a','False')//Changed Id is 2
why primary key can changed?Id changed is 2,is bug?
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