In an election Party A won 40% of all votes and Party B 35%, yet Party B won more seats

Why

Kartik's suspicion is healthy — more votes and fewer seats does sound wrong, and a citizen who notices odd results and asks questions is doing his job. But our elections are not one big national count; they are hundreds of separate contests, and in each one only the leading candidate wins, with every other vote in that seat carrying nothing forward. So a party can pile up huge margins in the seats it wins and lose narrowly in many others, ending with more total votes and fewer seats. Picture two teams playing ten matches: one wins three by huge scores, the other wins seven by a single run each — more runs overall, fewer matches. Test: add up the winning margins seat by seat and you can watch it happen. Jasmeet is right: this is a known feature of first-past-the-post counting, and mistaking a system's design for cheating stops you from arguing about the design itself.