This is an oddity I am noticing with Agenda on iOS12
Starting with an empty note the first line types normally, the problem is when I overflow the first line and type on the second. For want of a better word, the ‘container’ for the note doesn’t expand automatically so I end up typing my second line ‘in the dark’ so to speak. If I tap on the note then the container expands revealing the second line but with the cursor in a strange place, basically the place you tapped to expand the note, not behind the last character typed.
Experimenting with this further it happens on both my iPad Pros (10.5 and a 2018 12.9) but it is only happening on the two largest font size choices, the smaller ones work as expected.
This is with the latest version App Store of Agenda (not the beta, I’m still waiting to get on that) and the current version of iOS 12