dellus wrote

Garbled text:
There is a problem in LibreCAD with fonts containing arcs and a differing heigth/width scaling (width factor other than 1). The letters get torn apart then. If you want to change the width factor to 1 you also have to change the alignment to baseline left, otherwise it is not accepted. Just found by experimenting.
If you need a width factor other than 1 a workaround is to select a font without arcs, like Simplex, which consists of straight lines only.

The garbled text in the red boxes can't be edited as they are part of an inserted block. You have to "explode" that block first.
Or you also can edit that block (ind3_12) in the Block List with "Edit the active block in a separate window".

I have no answer for the the missing text. As it should appear within that red block, maybe it is a related issue.