over or under watering, from the look of the green leaves most likely over-watering. how much sunlight does it get?

It was most of the day sun. After I moved it now it gets morning to noon sun. All the yellow leaves fell off after a day so maybe that was it? I always thought it was a burning edges thing if it was too much sun but guess not?

hibiscus leaves don't burn in sunlight, in fact they are happy in full sun. check to see how wet the soil is, might be root rot. if not root rot it may just be getting acclimated to it's new location.

you say you just repotted? did you overwater it at the same time? you now have more dirt to retain water and the roots haven't grown in yet. Hibiscus hate wet feet - let it dry out between waterings. hibisucs can burn in sunlight if you move then from a shady location to full sun without acclimatizing - however it doesn't look like that....the leaves get this white/faded look....then you just wait for new ones to grow in. i have noted that my hibiscus don't like it when i fertilize them right after potting - i use miracle gro which has fertilizer in it - so i now wait a month or two to let them grow into their new pots first.