GETH keeps switching from from full sync to fast sync

I'm trying to do a full sync but GETH keeps switching to fast mode. Why is this and how do I stop it?

Here's my start command:
geth --syncmode "full" --cache 4096

and I get this WARN every time:
`WARN [08-06|09:31:30.671] Switch sync mode from full sync to fast sync`

I want to do a full sync, not fast. There's plenty of space on the SSD. I have 32GB of RAM. Not sure what's causing it.
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