Hi, Yami Meian!
You're welcome and thank you for dropping by to report this! -^.^)/ I'm really happy and I'll take all feedbacks you can give me~
Unfortunately, I still cannot find the error in the script coding & the only solution I can give you for now is to pick the other task in order to bypass it :')
Oh but the good news is:
the first person who reported this bug, suddenly solved this bug after the 1.4.4 update. I don't know how this happened, maybe Ren'Py is messing with us? x_x I'll keep you updated!