Problem with cut and paste between Apple devices?

When I cut a text on my mac and try to paste it in an app on my iphone or ipad, what is pasted is something I cut on my mac a while ago, not what is currently on the keyboard.

The problem is that cut and paste between devices only works intermittently.

I've already reviewed all the relevant Apple support pages, and I am doing everything I should to enable handoff

System requirements for Continuity features on Apple devices - Apple Support

Use Handoff to continue tasks on your other devices - Apple Support

and I've fulfilled all requirements.