what is "some issue"? looks fine to me

If you've got 'showdead' on you can see lots of previous submissions marked 'dead'.

None of them look obviously inappropriate but maybe the algorithm sees something I can't. There is a high-ish submission frequency (2-3 per day).

The posting account probably triggered some kind of spam classifier. No comments and a bunch of submissions in relatively quick succession.

Perhaps they're purchasing upvotes?