Please read the user manual before using any software tool.

Just use it for phred quality assessment and don't focus too much on other things.

A duplication level over 70% in E. coli RNA-seq data can be acceptable, especially given the small genome size and presence of highly expressed genes like rRNA or abundant mRNAs. This doesn’t necessarily mean the data is poor, but it's important to check whether rRNA was properly removed, as leftover rRNA can cause high duplication. Also, if the duplication is mainly from a few genes, it may reflect true biological expression. Deduplication tools can be used, but in RNA-seq, duplicates often represent real transcripts, so it's not always necessary.

the ONLY secure and free web tool for fastQC is right here:

https://genesyslifebio.com/fastq/