Vanishing cursor

I have just started having trouble with the cursor vanishing, towards the end of the line of text. It seems fine and visible, but will then disappear a few inches from the right hand edge of the text?

I have checked the settings, searched the forum, deleted and redownloaded the app - still disappears.

This on an iPad pro, 12"

I would be grateful for any thoughts - it’s both weird and makes knowing where I am more difficult.

Thanks