Bingo — your Q scores reminded me of this topic:
We did not get any more response on that topic, but it seems that this is a feature of the iSeq platform. I really do not know much about the iSeq — do you have any information about this platform and whether higher Q scores than, e.g., MiSeq are expected?
Ultimately, I think the bottom line is that you should just proceed as normal — the quality profiles are abnormal (compared to MiSeq, HiSeq, and non-Illumina platforms), but may be expected for iSeq.