strange error in dim

[Ganti4270]

while learning the usage of ezdxf package, i tried dimension a line in my code similar to the code in the example of documentation "Tutorial for Linear Dimensions" it draws fine, (I opened it in AutoCAD 2021), but when i move the dimensions in autocad ALL the texts disappear , dimensions arrow style changes , the text disappears,

i even tried some example of code from net
https://www.programcreek.com/python/example/111542/ezdxf.new
example 15 , this specifically does not happens for the dims that have 1000 & 300

is there some issue or am i doing something wrong (like wise the examples of the above site