No, it does not mean that there is anything wrong. There may have been some issues with Where's my Refund over the weekend and the following holiday on Monday, concerning the PATH Act and you should just keep checking while the IRS straightens everything out.
Processing, or Still Processing, simply means that the IRS is working on your return, it is the stage after accepted and before being approved. Here is more information on what's happening with your return
https://ttlc.intuit.com/replies/4689484
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