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I see the exact match domain #1 - plantas de casas .com so that makes sense. According to Majestic, you have 958 live links and 135,000+ historic links. That's a HUGE drop off in links. You used to have 1363 referring domains and now have 244. Those drops are cause for some worry. montesuacasa.com.br has 46k links and 731 historic referring domains - many more links than you and many more still alive. If I look through your historic links you were getting 128,000 from one site jeso carneiro.com.br - this site has pretty good authority itself but your link is now not found. So that was helping you to #1 - now it's not.