Can only write on top line of sign

Device Samsung Galaxy Tab A (SM-T350)

Description when you try to write on any other line besides the top line on a sign, it jumps you back to the top line, and if you write on the top line it will not let you change lines

Steps To Reproduce:
1) place a sign

2) go to any line excluding the top line

3) it will jump you back to the top line

4) try to switch lines again, and it will not let you