My Bioanalzyer® peaks seem to be shifted higher during analysis. Is this normal?

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Buffer components may cause higher base pair shift in crude Bioanalyzer® traces as show below. miRNA peak should be at ~150 bp for crude samples and at ~140 bp when purified. piRNA peak should be at ~ 160 for crude samples and at ~150 bp when purified.

BATrace_crude

Diluted Crude Sample

Purified Trace

Purified Sample