Firefox和IE上的CSS Flexbox不正确

I have recently been developing a website using flexbox, and have been doing so on Chrome. The site looks perfect on Chrome (and Safari, according to users) however it has some serious issues when viewed on Firefox and IE. I have tried to look online for documentation on which prefixes to include in my CSS and how to make it appear normal on those browsers, but I truly cannot find a summation or tutorial anywhere. Here is a sample of my CSS code, containing flexboxs that do not display correctly on Firefox and IE - I have recently been developing a website using