what the hell LEGO!?

i recently ordered some of the new LEGO MARVEL sets - but i recently got an update email saying my order was on backorder and now im confused this is the 1st time this has happened, the night i got them, all the sets were all in the first picture, but now the 3 out of the 5 have been taken off that list and now say 'backorder' im worried i might have to cancel the whole order all together - is this normal to happen or not...? i also dont want to spend $200 again😭🙏 EDIT - theyve also kept...