Understanding min sequence length of F and R/ quality scores and how it is impacting dada2 downstream

Hello friends-
I have just been assigned the bioinformatics part of a study after someone left their position.
My end goal is to classify sequences in samples that used ANML primers for COI.

After trimming primers I looked at the output quality plots and min sequence length:


Is it weird that the min sequencing length is so different between F and R? Ive don't this analysis twice with my own projects- and I have never had this issue.
I believe it is impacting my dada2 downstream- I am getting
Plugin error from dada2:

An error was encountered while running DADA2 in R (return code 1), please inspect stdout and stderr to learn more.

I have tried many different trunc lengths- but I suppose that is an issue to tackle later down the line?

I am using qiime2-2019.10 because that is what my classifier was trained on.

Thanks for help!

Hello Kara,

Can you post the full error from DADA2? That should give us more context for what may have caused this error.

Yes? My best guess is that R2 has been trimmed by another program before importing into a Qiime2 artifact.