Inaccurate reading [Bookoo Themis Ultra]

Just got the themis ultra, and it seems to have an absurdly inaccurate reading, have had it gone from tared (0g) all the way to 8-10g in a couple seconds without touching anything. I bought it after having their mini scale for year and have had no issues, just seems to be this scale specifically. Can't find anything similar online. Wondering if anyone else has a similar issue?