Isogen Style dimensions breaking/buggy & FFW allowance issue

See pics attached. we are sporadically getting dimensions breaking oddly and we are having a glitch with FFW allowance dimension text getting the dimension extension line running through it. they are both sporadic but we have sent the files ands style to hexagon and they are not able to reproduce it. what could this be?

In your windows regional settings, what are is the decimal symbol set to ?

ill check on that. whats weird is that when i drop the same line through a different but almost identical style it doesnt do this