Why does it take so much disk useage?

i have some website on my VPS. The filesize for folder "home" is 11gb. its ok. But  i wonder why do some other folders take so much disk useage like this? PLease see these picture:
1: https://i.gyazo.com/fcc5ce9c72c9acc07a1ea94bd5662990.png
2: folder "user" takes 24GB? What the hell ?
https://i.gyazo.com/0d293d2496430dae2dbf83d279d3974e.png
3: i follow the path to see. example for the folder "apache" . i see the log file is the biggest file:
https://i.gyazo.com/369e80b130277a75991059e88ac96d21.png
4: But when i click to the logs file, it takes me to the root folder with only the "swapfile" with the biggest size:
https://i.gyazo.com/10d97626917e481f9faa7b75c3ccf440.png
5: I check other folders with big size and also see the same thing. The matter comes with the log file.
Example: for the  maldetect folder:
https://i.gyazo.com/6261d5c88209651d71c10354a67bb056.png
The logs file takes the biggest size too.
Someone please tell me whats happenning, please.
My VPS is 55GB from Vultr, but the CWP is telling me that its 88% full of diskspace @@
Thats really a big matter. Would you please help me.
Thanks

Your problem isn't to do with CWP, it's your lack of knowledge in managing a server.
CWP in itself is actually quite lightweight compared to some alternative panels, easily fitting into 7GB, along with Centos 7.

I suggest beginning with reading about logrotate.