If you tried the baseUrl from gallery #2 in gallery #3's embedding code and gallery #2 did not display in place of gallery#3, then it would appear that there is something wrong with the embedding code (or surrounding code, for example the parent containers or slider JavaScript) for gallery #3.
However, if this were the case, and you swapped the baseUrls for gallery #2 and gallery #3, then I would expect gallery #3 to be displayed in place of gallery #2 (though I do not know if this is what happens).
As you have uploaded your gallery folders in their entirety, you could try embedding them in your page using <iframe>s instead of the baseUrl embedding code.
The <iframe> method is documented as Option #2 here.
However, the HTML errors on the page may be masking the real cause of the problem so I would try fixing them first before trying anything else.