Why does Instagram delete posts published via auto-posting immediately after publication?

Question

API

I publish posts through the mgp25/Instagram-API library. But he often deletes posts immediately, although I connect through a proxy, and there were no suspicions during the account connection. Removes more often pictures whose resolution is not square. and widescreen 1900x900 and so on. square like publishes normally. Does image resolution matter?
ps It happens that photos are also deleted when we publish through the application

Answer 1

Usually removes non-unique content

Answer 2

Manually try to publish and see what happens.