So the order on mobile is based on the order you created the block. If you create a new block and even if its on top it will be last on mobile since you made it last. If you accidentally use the first block on the second item you will have to redo the entire page. Either by deleting all blocks and doing it in order or if they all the same blocks move the content to the correct order of blocks created.
Really bad design. Hopefully then can fix it soon.