Unusual values since update

Hi all,

we are using Matomo in our organization and our Matomo has been updated by admins on March 25th to Matomo 3.13.4.

Without any apparent reason other than the update numbers such as Time Spent, Bounce Rate and Number of actions performed during visit have significantly changed since that date. Our Time Spent and Number of actions numbers have suddenly dropped by 60-70% and our bounce rate went up 30-40%.

Is there anything is the new release that can explain this sudden change ? Are any other websites experimenting the same issues ?

Thanks in advance for your insights !!