Problem with rolling over all my Roth 401k from employer to fidelity post tax account.

I have about 680k sitting at fidelity through my previous employer. About 200 was from a Roth 401k. Fidelity only allowing me to rollover about 100 into a post tax account the other 100 they’re saying go to pretax. I already created new accounts on the fidelity website but same outcome. Any idea why this might be happening? I don’t want to pay taxes again later.

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