Index/ Match not working

Can someone have a look at the attached worksheet and see if you can work out why certain index/ match formulas are showing a zero result in sheet "X47"? There will be an odd case where the 2 will not match due to the date not being in sheet "X08" but mostly will be evident. The reason I am doing this is because the code I have to do it sometimes skips data and I was trying to work out why but the index/ match is not working at all for some reason.
Thanks in advance