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Why there are some nonsense repetitive reads shown in the sequencing result fasta?

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  • Why there are some nonsense repetitive reads shown in the sequencing result fasta?

    When I check the reads included in the fasta file generated by MiSeq platform, I found some reads like this:
    GAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAGAAG
    or this:
    GTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTGTTG

    I BLAST them in the NCBI dataset, but no hit was obtained, meaning they are not actual sequences.
    Does anybody know why such reads were present in the MiSeq fasta file? Thank you.
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