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Why What causes bands/stripes in residual plots?

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Why causes bands/stripes in my residual plots?

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Why causes bands/stripes in my residual plots?

I ran a model and got the following residuals: original residual plot

I proceeded to log the fitted values to get an idea of what's happening at the lower end of my predicted values: logged fitted values residual plot

It was then I saw on the left side the banded values. Their formation in stripes made me wonder what phenomenon could be producing this? Should I be adjusting my model somehow or just chalk this up to a quirk when logging fitted values?

These are from a negative binomial mixed effect model in R, if that helps.