first things that come to mind is dirty particle getting stuck to the MAF sensor.
but the next obvious reason is your Intake temps calibration was not adjusted. it is a simple table that you have in the Fuel section section of Uprev. Unless its a Pro feature only which i do not know, the file below is the ROM i had for my 7AT as an example.
Then ofcourse there is a separate Fuel Compensation for Cold which is used if the Coolant is below 70-75C (158F-167F) then it will switch to the main table.
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