imperial units used while creating this library

IR SS1 (246)

for about a week i get this message each time i save corridor and tmls (i didnt have this problem on the same project before but i did mess a bit with variable manager). i created both tml, corridors stles from skratch. i got metric option selected in project defaults, i tried to save tml/ird with options convert imperial to metric. still nothing.  why i get this message? how to set it back to metric?

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