Whatsapp isn't backing up, however icloud backs up normally.

As title mention, my WhatsApp shows the last back up was June 20th, however my icloud back up every day.

Do you know if I lose my phone, I will lose all my chats from the past 7 months?

In the first pic, it can be seen behind the warning message, the last back up was June 20th.

Also, why other items are so big vs whatsapp starege ?

Icloud has enought space to back up that.