Drainage hose keeps disconnecting

My dishwasher (Hoover HDP 1DO39X) developed a leak a few weeks ago, after some testing and investigation, I determined it was the drainage connection hose and the clips keeping it in place had come loose.

I bought some new hose clips, removed the old ones, fit the new ones, and tried again. Still leaking, put sealant inside hose, just to see if that worked. Still leaking.

I ordered a new hose, fit it, and the problem seemed to have stopped. Go me! Until a couple of days ago, when it started leaking again, and then the drainage connector hose detached completely. Tried putting it back on, tightening the clips even more, it detached again. Tried putting sealant round it, tightened clips, detached again.

Does anyone know why it might be detaching completely, even with tightened clips, pushed right on and sealant round the inside of the hose? Am I over tightening it? Not tightening it enough? I just can’t figure out why it’s coming off completely.

That’s the hose and the connection point.