bug> lost xp

yesterday i lost 40k xp and loot after restart
now i got 2 wedding quests (40+k) first was fine and have 37k to next level ,then second q stuck
after restart of game i did drop q again on house and q was started but from 39k to next level ..q was done after i drop a cake
and with 40+k i should be next lvl but noo
i am still 39k to next level and no q ...
so this is 3th time i loosing xp like this
1st was oulaw adv then bk adv then this wedding q