Inconsistent memory usage between luci web interface and top command

I have recently installed OpenWrt and the memory usage shown in luci web interface is abnormally high.

Luci

However, the output of top contradicts with that.

(https://s2.loli.net/2022/02/27/mf3PgJVvz7bu5Nr.png)

(The new user restrictions prevented me from posting this as an image)

So, my question is: how much memory is actually being used?

This is a fresh installation so I have no idea where did this difference come from, any help would be appreciated!

Can you please post the complete LuCI memory section (instead of only one line)?