Steps to reproduce:

1. Configure the Docker plugin by Zabbix Agent 2 
2. Create host and choose template
3. Get container memory metrics

Result:
Zabbix shows a ridiculous value for my zabbix-mariadb container, for example:

The other containers also show the wrong values, but the diference is not that much (still pretty diferent, like my code-server, docker stats shows 96MiB, Zabbix shows more than 150MiB)
Using docker stats on my server: 

Expected:
Similar values to Docker stats.
Item I'm using: Container /example: Memory usage - Docker by Zabbix Agent 2