it now looks like that
[gallery ids="710,714,711,712,721,720,719,717,716,718,715,771,770,769,768,767,766,765,764,763,762,761,760,759,758,757,756,755,orderby=post_date ASC"]
but its still not in the correct order…
Where you put the quote marks is really important. Each parameter has to be separately in quotes and I just noticed that I missed it in my previous answer (!) as well as having a space between each parameter.
So, [gallery ids="710,714,711,712,721,720,719,717,716,718,715,771,770,769,768,767,766,765,764,763,762,761,760,759,758,757,756,755" orderby="post_date ASC"]
With the addition of the “type” galleries, some of the sort orders no longer seem to work, even if you are using the default thumbnail grid, apparently. The only other thing you can try is drag and drop them in the correct order or upload them initially in the correct order (maybe by renaming them). Sorry for no further suggestions.