I can confirm your issue with a font from the ubuntu repositories (your example file doesn't work without having your font installed), the font I used is "GFS Theokritos" from the ttf-gfs-theokritos package. The problem seems to be that the font does not have a bold version, Openoffice is trying to create a bold font from the regular font itself (which typically does not lead to a nice results). Still this "getting fussy" should obivously not happen.
Could you check whether your "Technical" font has a native bold version? Try this in a terminal:
fc-list | grep Technical
I can confirm your issue with a font from the ubuntu repositories (your example file doesn't work without having your font installed), the font I used is "GFS Theokritos" from the ttf-gfs-theokritos package. The problem seems to be that the font does not have a bold version, Openoffice is trying to create a bold font from the regular font itself (which typically does not lead to a nice results). Still this "getting fussy" should obivously not happen.
Could you check whether your "Technical" font has a native bold version? Try this in a terminal:
fc-list | grep Technical