Is there anyone here that can explain these weird values?

As far as the lean AFR numbers go, I see those in my car as well. After doing some research, it appears that, especially newer cars, do this. It's called "lean cruise" and happens for a while when you let off the accelerator and simply cruise. My guess is the fuel injectors injects very little fuel under such conditions and to burn what little there is more completely. Typically, lean burning vehicles require special cats to handle the extra NOx, but I don't know if this is the case in the US or not or if the period of such lean conditions are long enough to matter.

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I did a datalog again and saw some weird values in the csv file, for the STFT something like -140.00%, -240%, -390%, -549% ... what is with these abnormal values in the csv log ?

yep afr is normal when you let off the gaz

timing seem weird a bit but when you let of the gaz not much timing is needed and some time those value are n ot real is some situation

when do you see those value of short fuel trim
if you see them at full throthle could be ok
since older car run in open loop at full throthle so short trim is irrelevant

on my srt-4 that value would stay like the last one before full throthle.. is was just not refreshed anymore