Big Query insertAll method in Java is not reflecting the changes in Table - google-cloud-platform

Question

I am trying to insert data into a Big Query table using the method insertAll.
This is how my insert method code looks like -
public void insertIntoTable(String datasetName, String tableName) {
TableId tableId = TableId.of(datasetName, tableName);
String fieldName = "testField";
Map<String, Object> rowContent = new HashMap<>();
rowContent.put(fieldName, "testVal");
InsertAllResponse response = bigquery.insertAll(InsertAllRequest.newBuilder(tableId).addRow("rowId", rowContent).build());
if (response.hasErrors()) {
for (Map.Entry<Long, List<BigQueryError>> entry : response.getInsertErrors().entrySet()) {
System.out.println(entry.getValue().toString());
}
}
}
Although it is not throwing any error, but still data is not getting inserted into my table.
As per there access-control document:
https://cloud.google.com/bigquery/docs/access-control
To use the insertAll method the user would require bigquery.tables.updateData permission. And for using that permission the user need to have the bigquery.dataEditor role, which I already have.
There is no issue with the permission because in another method I am creating a table, and the table is getting created successfully in Big Query.
The tableName and datasetName is also correct, I tested it in the debug mode.
Another issue that I can think of is type mismatch issue. But thats not the case either, because I checked it and the type is String only. Attached schema details below -
Can there be any other issue which I may be missing out here?
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Edited Part -
It has been pointed out to me that the stream data does not reflect in the UI, for viewing the data we have to query the table.
Now I am facing a new issue.
I executed the above function 6 times, each time with a different value. Basically I was changing only this line -
rowContent.put(fieldName, "testVal");
The first time when I executed the method, the insert value was testVal.
The other five times when I executed the method, I modified this line of code -
Execution 1: rowContent.put(fieldName, "testVal1");
Execution 2: rowContent.put(fieldName, "testVal2");
Execution 3: rowContent.put(fieldName, "testVal3");
Execution 4: rowContent.put(fieldName, "testVal4");
Execution 5: rowContent.put(fieldName, "testVal5");
So ideally in my table there should be 6 rows with the values -
testVal
testVal1
testVal2
testVal3
testVal4
testVal5
But I am able to see only two rows when I am querying my table.
Why it is showing only 2 rows instead of 6?