Generative AI completely ignores instructions (sometimes)

Having experimented with Generative AI in Photoshop over the last weeks I am genuinely puzzled why at times the resultant will follow my instructions with fair results, at time be unable to translate my instructions to the image, and disturbingly often ignore my instruction entirely.

To add to that it often generates 3 version of the mess it makes, thereby ‘costing’ me a substantial load of my credits, or worse extra credits I have paid for in addition to those in my Pro plan. 

A recent test was a lounge scene where I selected the couch (besides the only couch in the fairly plain scene) and asked it to change to the colour to a particular hex colour and a particular material. In addition I asked that those instructions aside the scene does not change in any way whatsoever. The result: it removed the couch entirely. And for this I lost a substantial amount of my DAI credits. 😖

Why? 

Edit:
I’d also like to add that I Adobe a) can clearly see the results are neither saved nor exported and b) is aware of the 100% negative feedback.

So why then deduct the credits from my account.

If Adobe was to purchase GPUs for their server farm and a truckload of ice cream would arrive they would not pay for it. Why do we have to?