Every time I travel from Netherlands to UK and back (1 hour time difference), something unexpected happens with cards to review.
Yesterday I took some screenshots while boarding the plane. Review forecast was 171 cards for May 19th and 237 cards for June 3rd. After landing, it became 44 and 153 cards for these dates respectively.
I'm using iOS app.
As someone that travels a lot this is also an issue I encounter (macOS version). Having a way to choose your timezone/time where the new reviews are added would improve the quality of life of Mochi so much!