Cloud usage calculation suddenly off

I try to stay below 10 MB, normally around 7-8 MB and then selectively delete chats to stay below the free-storage threshold. But now, suddenly, my usage supposedly went up to almost 13.5 MB, thus exceeding the limit.

Here is the thing: I didn't add any new chats or files. More so, I removed all files from the cloud data, and my chats are supposed to make up 13.07 MB (96.80% of total usage).

As mentioned I didn't do anything to make the storage go up. I don't use the KB Rag feature.

And here is thing: if I export all data (Chats, Folders, Prompts, Agents, Plugins, Profiles, Preferences, Model Settings, Keyboard Shortcuts, Custom Models), the resulting Json file is 8.3 MB. That is pure text with additional Json metadata fields.

Obviously, something has gone wrong in the cloud storage calculation, effectively preventing me from using the sync feature.