ubuntu - High server load with no processes using CPU?

I'm new to managing servers, and I've run into something
that's stumped me. I received a warning from my VPS provider informing me that my load
usage was very high. I hadn't run into this problem before, so I attempted to look into
it. Unfortunately I haven't been able to figure out why this is the case after quite a
bit of research.

The server is, I believe,
OpenVZ, with plenty of RAM to spare (2 GB) and a decent processor with a SSD. I've shut
down nearly every process that I could imagine that might be an issue besides apache.
I've inspected my top/htop output very carefully and I can't detect anything unusual.
But notice the load average. It should be around 0 with this level of CPU usage,
right?

href="https://i.stack.imgur.com/1cOEs.png" rel="nofollow noreferrer"> src="https://i.stack.imgur.com/1cOEs.png" alt="enter image description
here">

I was wondering if it was
maybe something to do with disk usage, but since this is OpenVZ apparently I can't use a
tool like atop to determine more information about disk
activity.

How can I debug this further?
Thanks!

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