Docker stats memory usage is suspiciously low

Docker Engine General
1

I have many virtual machines on AWS each running same set of applications. while doing some memory analysis I found something odd. In one of the instance running docker stats command shows the following :

CONTAINER. MEM USAGE / LIMIT
app_name 520.2MiB / 15.67GiB

The same app when i check in another instance it shows much lower memory usage :

CONTAINER. MEM USAGE / LIMIT
app_name 17.43MiB / 15.67GiB

Am I missing something here. Why is showing such low memory in the other instance ?Please give an explanation.