Having trouble with scale

hi ya , i have down loaded an up date two days ago , then i tried to cut a new project in wood veneer , instead of coming out 30 mm it came out 3 mm . a burnt hole . checked the scales on the template … all good . so next i made it 180 mm … it came out 18mm . so i then tried to uo it to 300mm but it then exceeds my cutting table size so wont cut .
also now when i close down the lightburn window i get a message this program is still streaming … Maybe ive made some rookie error but i cant seem to find the issue . any suggestions please …
Phil