Hello and thank you for the answer with the tips.
I have now deactivated "IP Traffic (via IP Monitor)".
I also created and selected the same folder in jffs / traffic.
I deleted the spdmerlin script... total empty jffs/addons folder !!
There are two tabs under the Trend Micro Traffic Analyzer screen (left menu).
One is the "Traffic Monitor" and the other is the "Statistc" tab.
This are the two tabs which are not working at my Router...
The Trend Micro privacy policy is of course also activated.
I checked all settings again, restarted and gave the router some time to collect data.
NOTHING ... I get no data, no statistics ... I cannot display apps or assign traffic to the individual devices

I'm grateful for any help ...
Otherwise, maybe only a reset and completely reset everything will help?!?!
PS:
I also tried
this