Sri Lankan born with Malay ancestry

Hello. I'm a Sti Lankan Malay and this is my breakdown. Even though I expected the Indonesian to be the highest percent, I still expected it to be higher than what it was, especially in relation to the South Asian groups. My parents generation and those before them were notorious in marrying other Malays, similar to the other groups in Sri Lanka. I guess this means there were a lot more secrets involved haha.