String numbers and text not staying in place

I must be doing something wrong but this is maddening. I cannot keep string numbers and text in place. I created the text and I and II using Shift X. When I enter Engrave to move the I in place, the text and the II for the A string moves.
I tried to attach a screen shot but can’t seem to.

I’m not sure whether I can help with the moving issue, but if you’re going to be using lots of I and II string indicators, it might be easier to create them as custom playing techniques - if you make them as glyphs, they then should centre-align with noteheads automatically and might interact a bit more reliably with other text objects at the same positions?

Thank you Lillie