Since Piwik PRO and Matomo use same tracking API, there are issues with using both products on one website. Here is a guide how to fix it: How to install Piwik PRO on sites with Matomo code
Since Piwik PRO and Matomo use same tracking API, there are issues with using both products on one website. Here is a guide how to fix it: How to install Piwik PRO on sites with Matomo code