The plugins have automation that toggles the Bypass/Enable State of the plugins, with the various plugins being enabled during different regions on the time line. I see in your video you are fighting against the automation.
I have made a quick video that illustrates, viewing and toggling the automation for the Bypass/Enable.
Plugin Automation - Toggle bypass the video has subtitles, which may make it clearer.
I will make a better video and post it on the official Strata Youtube channel a little later. Thank you for your question Tomoyuki and let me know if I can provide further clarification, if you have suggestions of how Strata could be more effective for you please let us know.
The thinking behind automating the plugins for different regions, (points on the time line), is for efficiency for editing and CPU, when one setting of a plugin is not appropriate for every sound in a particular track, and having more tracks would probably not be optimal as the sounds have a lot in common. in the case of the Fuel .rpp for example, the Plugins are enabled for Small, Medium and Large sets of regions.