That actually is not a mistake. For Chad/Romania, Chad actually has a slightly darker blue stripe, but they are indeed very similar (see this link for more explanation). For Monaco/Indonesia, they are just identical (with a slight difference on the official length:width ratio, but that doesn't show properly in this quiz)
I made this quiz before the Picture quiz feature had become available. As it is not a picture quiz, I am unable to change this in this quiz. However, I have created a new (picture) quiz which is ordered left to right. It is awaiting approval now, and once it is online I will put a link in the description.
A few days, mainly because each flag is linked individually to their corresponding Wikipedia pages. The picture quiz version only took a few hours though (link is above)
I got 196 anyway because I remebered that I hadn't had to spell Tegucigalpa yet! Great quiz