According to pool statistics my current hashrate is less than the reported one by 40 mx.
I understand that there is a margin of error of 10%, but 30 % is a lot.
If you are mining ETH, write your real profit, according to the statistics of payments from the pool.
Are you using Wi-Fi or ethernet connection?
Also, do you have VPN enabled?
Check if there is any network issue.
Also try to change the server location and check if that works.