Hello! First of all, thanks for your hard work!
Today I noticed the same bug. I tried to set offset, but it was jumping further and further. I was looking for the solution and I just changed tacan code from 44X to 1X in the editor and I was able to set correct offset and TACAN mark was where it should be (carrier).
I have another question. I can get course line only if scale is out of AUTO mode and with 100, but when I get closer the course line is showing all the time without issue. It is a normal behaviour or a bug?
BR
AG