Accidently moved ROTH 401k into Rollover IRA

Earlier this March I left an employer and received 2 rollover checks from my ROTH 401k. One check for pre-tax money and one for after-tax money. I foolishly rolled over both of these checks into a Rollover IRA, instead of putting the after-tax portion into a roth account. So now I have years of after-tax contributions sitting in a retirement account that is meant for pre-tax contributions. Has anyone been in a similar situation? What can I do to go about correcting this?

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