JSF sessions are mixing

Hello everybody!
I have this serious problem:
We have a pretty big jsf application which has been put to a stress test of 300 users. Not only the test failed because of a special critical section in the UIComponentBase class, because of which we had to change our jsf implementation but we experienced the following problem:
Some of the users claimed to be unable to start an action or to try to do one thing and to get a different result. More specifically trying to go to one page and to get another or trying to start an action which fails and the user gets the same page as a result.
Can anyone tell what could be the reason?
Best regards,
IL

Thanks for the response.
Below is the issue details more detailed:
We have created table with parallel degree 8 and I am not able to insert data into that table and the sessions are blocked state.
I am seeing event names in blocked state are px deq: parse reply px deq: execution msg
Temp_table -- parallel degree8
I am selecting the data from multiple tables as per my requirement and trying to insert that data into the temp table.
Below is the query:
Insert into /*+PARALLEL(Temp_table)*/ Temp_table(report_date,quantity,revenue)
select /*+PARALLEL(Temp_table_v)*/ report_date,quantity,revenue from Temp_table_v;
In Temp_table_v we are joined the multiple tables and those tables are having millions of records and in that view also we have added parallel hints.
Please help.

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