The purple shading means "This information has supporting details". So, it appears to me that somehow additional information was entered related to box 4c that "zeroed out" the 4a and 4b entries you made.
If you are using the Download/CD version of TurboTax, go to Forms mode, find the K-1 Partner form in the left column, click on it and it will open in the window. Find the box 4c and click the + next to the box to open the supporting statement.
If you are using TurboTax Online, you may have to delete the K-1 and re-enter it to "purge" whatever found its way into that supporting statement.
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