When you are applying for Indian visa there are many reasons for visa denial and when the applicant is not giving the correct information. Every country has their own guidelines for foreign visitors. So the government of India wants every foreign visitor to abide by the rules so that you can avail all facilities of India e-visas very comfortably.
The reasons can be giving false travel documents to generate duplicate identities, having past and current criminal background, the information on your passport like name, address, Date of birth not the same as on the other documents, wrong formats and size for documents and photographs and so on. If an applicant is applying for Indian e-visa through two different websites. In this case the Indian consular will reject the multiple e-visa request for the same applicant and passport is not in good condition and so on.