Sequence generator in h2 does not provide unique values

For H2 database in my spring boot api test I saw that there is an insertion script that looks like:

INSERT INTO STORES_TEMPLATE (ID, COUNTRY, TEMPLATE_NAME_1, STORES_1) VALUES(STORES_TEMPLATE_ID_SEQ.NEXTVAL,'country', 'template_name', 'stores');
INSERT INTO STORES_TEMPLATE (ID, COUNTRY, TEMPLATE_NAME_2, STORES_2) VALUES(STORES_TEMPLATE_ID_SEQ.NEXTVAL,'country', 'template_name', 'stores');
INSERT INTO STORES_TEMPLATE (ID, COUNTRY, TEMPLATE_NAME_3, STORES_3) VALUES(STORES_TEMPLATE_ID_SEQ.NEXTVAL,'country', 'template_name', 'stores');

The entity looks like:

@Entity
@Getter
@Setter
@NoArgsConstructor
@Table(name = "STORES_TEMPLATE")
public class StoresTemplate {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "STORES_TEMPLATE_ID_SEQ")
    @SequenceGenerator(name = "STORES_TEMPLATE_ID_SEQ", sequenceName = "STORES_TEMPLATE_ID_SEQ", allocationSize = 1)
    private Long id;

    @Enumerated(EnumType.STRING)
    private CountryEnum country;

    private String templateName;

    @Lob
    private String stores;

    public void setStores(List<String> stores) {
        this.stores = String.join(",", stores);
    }

    @JsonIgnore
    public List<String> getStoresAsList() {
        return Arrays.stream(stores.split(","))
                .distinct()
                .collect(Collectors.toList());
    }

}

On production everything works just fine, but on my test environment with h2 database the sequence generator gives me ids that are duplicated with the ids of the predefined by the sql migration data. What can I do to fix my tests?